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Drainage shovel for a narrow trench

Updated: October 2026

You are opening a narrow channel for a drain, a duct, a cable, or a fence post, and a general pointed shovel is the tool that spoils it. A drainage shovel is a slim blade that works inside the cut. A wide round mouth drags the walls in. The three narrow tools in this amazon.co.uk set are the Bulldog 5CLAM, the Spear & Jackson 2154HK, and the Roughneck ROU68238. None of them is sold here as a BS 8020 insulated shovel. The set is on the [pointed shovel comparison](/hub/digging-tools/pointed-shovel). Peter F. checked the listings on 19 October 2026. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.

You are opening a narrow channel for a drain, a duct, a cable, or a fence post, and a general pointed shovel is the tool that spoils it. A drainage shovel is a slim blade that works inside the cut.

Our top picks

Spear & Jackson Spear & Jackson 2154HK draining shovel

Best overall

Spear & Jackson Spear & Jackson 2154HK draining shovel
9.4/10about £16.20
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Roughneck Roughneck ROU68238 drainage shovel

Rank 2

Roughneck Roughneck ROU68238 drainage shovel
9.4/10about £21.54
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Bulldog Bulldog 5CLAM cable laying shovel

Rank 3

Bulldog Bulldog 5CLAM cable laying shovel
9.4/10about £11.54
View offer
On this page
  1. 1.Why the blade has to be narrow
  2. 2.Three narrow shovels in this set
  3. 3.Services before the first push
  4. 4.If you strike a cable

Why the blade has to be narrow

Wonkee Donkee describes a cable-laying shovel as a blade about 115 mm across the cutting edge and about 280 mm tall. A wide pointed blade, such as the 300 mm by 225 mm head on the long Roughneck ROU68044, is a good open-ground tool and a bad trench tool. A sharpened edge cuts roots and also cuts a cable you did not expect. The width decides whether the trench survives. What is buried decides whether you should push the blade in at all. Length for ordinary beds is in the pointed shovel buying guide.

Three narrow shovels in this set

The Bulldog 5CLAM is the cheapest narrow tool here, at about £11.54 on 19 October 2026, listed at about 2 kg, with 4.7 stars from 316 reviews. The head is a solid-forged narrow blade on an all-steel shaft. The listing describes the narrow blade for narrow trenches, including clay. One review says the trench became too narrow for a foot on the shoulder, so they added a block of wood. The Spear & Jackson 2154HK is the heavy forged drainer, at about £16.20, 2.79 kg, with 4.7 stars from 2,403 reviews. Reviews mention fence-post holes, roots, clay, and pieces of brick. The Roughneck ROU68238 is the fibreglass option, at about £21.54, listed at 1,070 mm and 1.98 kg, with 4.7 stars from 1,336 reviews. The blade is heat-treated carbon steel with a sharpened edge and foot treads. Reviews describe holes about 600 mm deep for fence posts, which is one reviewer’s reach, not a promise that every service sits deeper than that. It does not say the edge is serrated. Choose the Bulldog for the low price, the 2154HK when clay justifies 2.79 kg, and the ROU68238 for a tread at 1,070 mm. None of those shafts is insulation near a live cable.
Spear & Jackson Spear & Jackson 2154HK draining shovel

Testsieger

Spear & Jackson Spear & Jackson 2154HK draining shovel
9.4/10about £16.20
View offer

Services before the first push

The Health and Safety Executive’s HSG47 is the sequence, not a slogan. Plan the work, obtain plans, detect and mark, then dig trial holes by hand and dig alongside a service rather than onto it. HSE’s electricity excavation guidance says to use insulated tools near cables. HSE’s gas guidance says mechanical plant should not come within 500 mm of a gas pipe. That 500 mm figure is about plant, not a licence to hack closer with a sharp shovel. The Energy Networks Association’s Think Before You Dig campaign makes the same practical point: plans are a guide, you scan with a CAT, and you phone before you dig. In Great Britain the number is 105. In Northern Ireland it is 03457 643 643. Posture, and the rule against using the shaft as a pry bar, is in how to use a pointed shovel.

If you strike a cable

If you strike a cable, leave the hole, keep people clear, and call 105 in Great Britain. Do not pull the shovel free if it is in contact. Northern Ireland uses 03457 643 643. A fence-post hole of about 600 mm in a review is not evidence the ground is clear. Services can be shallower than that.

Common questions

Drainage shovel or cable-laying shovel?
A cable-laying shovel, in Wonkee Donkee’s description, is a very narrow blade, about 115 mm at the edge and about 280 mm tall, meant for a slot rather than for bulk spoil. A drainage or post-hole shovel can be slightly more generous and often adds a tread and a longer shaft. In this set the Bulldog 5CLAM is the cable-laying pattern, and the 2154HK and the ROU68238 are the draining and post-hole pattern. Both are narrower than a general pointed shovel.
Which of these three is lighter?
The Roughneck ROU68238 is listed at 1.98 kg, the Bulldog 5CLAM at about 2 kg, and the Spear & Jackson 2154HK at 2.79 kg. The 2154HK is the one reviewers find tiring on a long session, because that mass arrives before any clay is on the blade. Lighter does not mean safer near a cable. The lighter Roughneck is fibreglass and still not described as BS 8020 insulated.
Do I have to scan before a garden cable run?
Yes if there is any chance of an existing service, which is the usual case near a house, a path, or a previous shed supply. Energy Networks Association guidance is that plans are only a guide and that you scan with a CAT. Phone 105 in Great Britain or 03457 643 643 in Northern Ireland. A short garden run is still an excavation. “I know my own garden” is not a locate.
Is fibreglass enough insulation?
No. The ROU68238’s fibreglass shaft is a garden handle with a Power Ring socket. The listing does not claim BS 8020, which is the standard associated with insulated tools for this kind of risk. The Bulldog and the 2154HK are steel and conduct. HSE guidance near cables is to use insulated tools. A fibreglass garden shovel is not that tool, however dry the grip feels.
What if I hit a cable?
Stop. Leave the shovel where it is if it is touching the cable, keep other people clear of the hole, and call 105 in Great Britain. Do not pour water in, do not keep digging to identify the line, and do not assume a nick is safe because the power stayed on. Northern Ireland uses 03457 643 643 for the equivalent contact. The same stop applies if you hit a gas pipe: out of the hole, no plant, and the emergency line, not another scrape with the blade.

Related pages

Pointed shovel vs spade

Pointed shovel

Best pointed shovel UK: long top pick, short value

Pointed shovel buying guide: length, blade and shaft

How to use a pointed shovel: lift, turn, do not pry

Sources

Sources from the category digest. Listing prices and ratings were taken from amazon.co.uk on 19 October 2026.

  1. B&Q planting and digging guide (retrieved 19 October 2026)
  2. Wonkee Donkee, shovel blade shapes (retrieved 19 October 2026)
  3. Wonkee Donkee, shovel shafts (retrieved 19 October 2026)
  4. Wonkee Donkee, cable-laying shovel (retrieved 19 October 2026)
  5. HSE HSG47, avoiding danger from underground services (retrieved 19 October 2026)
  6. HSE, electricity and excavations (retrieved 19 October 2026)
  7. HSE, good handling technique (retrieved 19 October 2026)
  8. Energy Networks Association, Think before you dig (retrieved 19 October 2026)