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Best socket lock UK: one cover, one key socket

Updated: 23 October 2026

You searched for the best socket lock UK and you want a name. This amazon.co.uk set can name a cover when the plug has to stay in, and a key socket when the outlet itself has to lock. It cannot name one winner for both jobs. A sort by stars would hand you Knightsbridge on 5.0 from 3 reviews. The [socket lock comparison](/hub/sockets-and-extension-leads/socket-lock) holds the prices: PlugMinder 80 mm at £21.99, PlugMinder 38 mm at £18.99, and CU9LOCKN at £13.88. We read those amazon.co.uk listings on 21 October 2026. A qualifying purchase can earn a commission at no extra cost to you.

You searched for the best socket lock UK and you want a name. This amazon.co.uk set can name a cover when the plug has to stay in, and a key socket when the outlet itself has to lock.

Our top picks

Knightsbridge Knightsbridge CU9LOCKN

Best overall

Knightsbridge Knightsbridge CU9LOCKN
6.7/10about £13.88
View offer
PlugMinder PlugMinder 80 mm cover

Rank 2

PlugMinder PlugMinder 80 mm cover
8.6/10about £21.99
View offer
PlugMinder PlugMinder 38 mm cover

Best value

PlugMinder PlugMinder 38 mm cover
8.2/10about £18.99
View offer
On this page
  1. 1.If the plug has to stay in
  2. 2.If the outlet itself must lock
  3. 3.What the stars do not show
  4. 4.Covers that are not in this table

If the plug has to stay in

For a plug that must stay connected, start with the PlugMinder 80 mm double, B0DJBKJMJ8, at £21.99, when you have measured a deep plug from the wall. The listing prints Type G. The bullets include two tools, a red and green window, and a fit behind the existing faceplate screws. The star line is 4.6 from 43, and the same review text sits on the 38 mm ASIN, so that 43 is one block. That is the top pick in this set for a deep plug. Skip it when the plug is a normal 13 A body inside 38 mm. The 38 mm listing, PMDBLWW38, is £18.99 and is the best value only in that case. It does not print Type G. The maker's pages say keys, while the Amazon bullets say a tool. Skip both if reviewers call the plastic brittle, or if a moulded plug needed the cable exit cut.

If the outlet itself must lock

Choose Knightsbridge CU9LOCKN, B0DKPFKTCS, when you are replacing the socket and the point must lock on or off. It is £13.88, one Type G outlet, 13 A, double pole, with a neon and two keys. The line is 5.0 from 3. Amazon does not state the box depth. The ML datasheet says 35 mm, BS 1363-2, IP20, and thermoset resin. Screwfix lists £16.69 including VAT and a plastic finish, while Amazon says Metal. Quote the source. Do not merge them. Skip it when a fridge or router must stay available without a key. The bullets lock the socket on or off. They do not describe a cover over a plug.
Knightsbridge Knightsbridge CU9LOCKN

Testsieger

Knightsbridge Knightsbridge CU9LOCKN
6.7/10about £13.88
View offer

What the stars do not show

The PlugMinder 4.6 from 43 is one block on two ASINs. Counting 43 plus 43 would double those comments. Knightsbridge at 5.0 sits on three ratings and two texts. Warmhm, B0FP1LDPMD, is 4.8 from 7 at £10.49. The title says UK and US, Type G is absent, and Screw-In disagrees with a review that describes a self-adhesive pad. Sewroro, B0HD78MSBM, is £9.89 with no Customer Reviews line. Marhynchus, B0DJWDZR87, is £12.88, 1.9 from 2, a 40 mm industrial lockout, not a BS 1363 cover. None of these lines is a laboratory ranking.

Covers that are not in this table

Socketsafe and SocketLoc are not rows here. The Socketsafe shop lists £10.95. AlzProducts lists the double at £14.95 including VAT for standard plugs, not larger adapters. The '70,000 customers' line is a claim we are not using. SocketLoc snippets show about £20.82, 3.4 from 17, and a bullet that it is not for plugs deeper than 20 mm. Pin-in blanks are not locks. An 80 mm PlugMinder is for a deep plug that must stay in, a 38 mm PlugMinder is for a measured standard plug, and CU9LOCKN is for an outlet that must lock. Use the buying guide before you add a second identical review count.

Common questions

When is 38 mm the wrong pick even if it is cheaper?
It is the wrong pick when the plug is a plug-top brick, when the lead leaves in a bend past 38 mm from the wall, or when a moulded body will not clear the cable exit. The shared reviews include plugs that needed the cover cut, and a 58 mm order that still would not take a long internet plug. Saving £3 does not help if the cover will not close.
Is the Knightsbridge the pick when the socket must be locked off?
Yes, for that job. CU9LOCKN is the key-lock outlet in this set, at £13.88, with two keys in the bullet and one Type G socket. Check a 35 mm back box on the wall and on the maker sheet, because Amazon does not print the box depth. Skip it if you needed a cover rather than a new socket.
Why not buy the 5.0-star socket for a fridge that must stay on?
Because the product locks the outlet on or off. It does not keep a plug inside a box. A key that can turn the fridge off is the wrong tool for a fridge that must stay on. The sample is also three ratings and two texts, which is too small to outweigh the job.
Can I treat 43 plus 43 reviews as 86?
No. The UK review text on the two PlugMinder ASINs is the same block, and each listing line says 4.6 from 43. One review inside it describes a 58 mm order. Adding the counts would count those comments twice. Use 43 once.
What should I skip if the listing says UK and US, or 40 mm inside diameter?
Skip Warmhm as a proven British double. The title says UK and US, and Type G is not in the attributes. Skip Sewroro for a UK 13 A socket: no rating and no pattern. Skip Marhynchus as a 13 A cover. Forty millimetres there is an industrial inside diameter, the stars are 1.9 from 2, and there is no review text.

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Socket covers vs lockable socket: a blank or a lock

Sources

Sources taken from the research digest. Listings were scored on 21 October 2026. This page did not run a lab test.

  1. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 21.10.2026)
  2. IET Wiring Matters, socket-outlet protectors (February 2020) (retrieved 21.10.2026)
  3. BEAMA position paper on socket outlet covers (5 June 2017) (retrieved 21.10.2026)
  4. Electrical Safety First — socket covers (retrieved 21.10.2026)
  5. Electricity at Work Regulations 1989, regulation 12 (retrieved 21.10.2026)
  6. HSE HSG85 (retrieved 21.10.2026)
  7. Approved Document P (England, 2013) (retrieved 21.10.2026)
  8. CU9LOCKN datasheet — ML Accessories (retrieved 21.10.2026)