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Best surge-protected extension lead for a UK socket

Updated: 23 October 2026

You want one best surge protector extension lead: a top pick for a defined job, a best value row when price matters more than switches, and a stop when the plug says Type B only. This page is from the Products Compared editorial team on 20 October 2026. Prices from about £8.70 to £29.99 are in the [extension lead with surge protector comparison](/hub/sockets-and-extension-leads/extension-lead-with-surge-protector). It is not a lab test. A qualifying purchase can earn a commission at no extra cost to you. The checks are on the [buying guide](/hub/sockets-and-extension-leads/extension-lead-with-surge-protector/sub/extension-lead-with-surge-protector-buying-guide).

You want one best surge protector extension lead: a top pick for a defined job, a best value row when price matters more than switches, and a stop when the plug says Type B only.

Our top picks

Masterplug Masterplug SWSRG4210N

Best overall

Masterplug Masterplug SWSRG4210N
9.0/10about £9.50
View offer
Masterplug Masterplug SRG4210N

Best value

Masterplug Masterplug SRG4210N
8.3/10about £8.70
View offer
Addtam Addtam 4-way with USB-C

Alternative

Addtam Addtam 4-way with USB-C
8.5/10about £15.99
View offer
On this page
  1. 1.Top pick, and the job it is for
  2. 2.Best value at about £8.70
  3. 3.Why the higher joule headlines stay behind
  4. 4.If you need USB or a tower

Top pick, and the job it is for

The top pick is the Masterplug SWSRG4210N, ASIN B07XJFH54B, at about £9.50. It scores highest with 370 J stated, a switch on each of four sockets, and 4.8 stars from 1,232 amazon.co.uk reviews. Reviewers use the switches to turn small appliances off without unplugging, and they treat the 2 m cable as a practical length. Connected-equipment wording up to £1,000 for three years is warranty language, not proof of the plug in the box. Skip it if the lights must stay dark. UK reviews say the switch LEDs and the end lights stay bright in a bedroom. Skip it if you need USB. The plug table lists Type G and Type B, and a BS 1363-2 sentence is not in the bullets, so confirm the moulded UK plug on arrival.

Best value at about £8.70

The best value pick is the white Masterplug SRG4210N, ASIN B07XMZSL25, at about £8.70. It is the lowest shelf price in this set with 370 J stated and four unswitched sockets. It carries 4.7 stars from 1,267 reviews. The bullets name televisions, claim shuttered sockets, wall fixing, a BS 1363-2 line, and connected-equipment wording up to £1,000 for three years. You trade the per-socket switches for about eighty pence less, and a body about 25 cm long, which helps when plug-top supplies sit side by side. Take the switched four-way when each socket must turn off independently. One review said the supplied plug did not match the photos, so check the moulded plug against the listing.
Masterplug Masterplug SWSRG4210N

Testsieger

Masterplug Masterplug SWSRG4210N
9.0/10about £9.50
View offer

Why the higher joule headlines stay behind

A larger joule number is not an automatic win. HAFINO states 1,800 J, but its bullets cite FCC, CE and UL rather than BS 1363, so it stays behind the Masterplug rows. Addtam claims 1,050 J with four switched sockets and USB-C plus USB-A. The pack-size field says five items with no contents list, and the warranty lines disagree. Belkin’s four-way lists 525 J and the six-way lists up to 650 J. Both rows share 6,912 reviews and the same opening titles. The six-way lists Type B in both plug fields, with no 13 A line. The four-way mixes Type G with Type B. Until the plug is confirmed Type G, neither Belkin row is the default. The figures are on the joule figure guide.

If you need USB or a tower

USB and a tower change the job without changing the fuse. Addtam at about £15.99 states two USB-C and two USB-A ports, with no watt figure. Anker’s tower at about £29.99 states 300 J, Type G in both plug fields, and 20 W on USB-C only when USB-C1 is used alone. One review says it can tip when every plug is in. DEWENWILS is the 3 m strip with Type G in both fields, and 270 J only in a bullet while the surge field says 13 A. HANYCONY at about £14.98 states no joules and lists Type B only. Skip that row for a default UK pick.

Common questions

Which lead is the top pick in this set, and for what job?
The Masterplug SWSRG4210N four-way switched bar, for a buyer who wants 370 J stated, individual switches and strong review volume at under £10, provided you can live with bright status LEDs and you do not need USB on the strip.
Which lead is the best value, and why is it not the Anker?
The unswitched Masterplug SRG4210N at about £8.70, because it is the cheapest row with 370 J stated and a BS 1363-2 line in the bullets. The Anker tower solves a different desk problem at nearly four times the price.
Should I pay more for the Belkin 650 J row?
Only after you confirm a UK plug. In this set the six-way lists Type B in both fields and shares its review block with the four-way. The joule headline does not override an unresolved plug line.
Is the HAFINO 1,800 J claim the winner?
Not in this scoring. Socket count and the headline joule figure are offset by certification text that does not mention BS 1363 and by group switches rather than one switch per socket.
What do I skip if I need USB-C?
Skip the plain Masterplug bars. They do not describe USB. Consider Addtam for a stated split of USB-C and USB-A, or Anker if you accept the tower price and the 20 W USB-C-alone rule. Skip HAFINO if you require USB-C specifically, because a review wanted USB-C that the listing does not state.
Who should not buy the switched four-way?
Anyone who needs a dark bedroom with no glow from switch LEDs, or anyone who must have USB ports on the same bar without a second adaptor.

Related pages

Surge lead for a TV and PC

Extension lead with surge protector

Surge-protected extension lead buying guide in the UK

How to use a surge-protected extension lead safely

What joules mean on a surge-protected extension lead

Sources

Sources taken from the research digest. Shelf prices, stars and review counts are the amazon.co.uk figures in the stored listings. This page did not run a lab test.

  1. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 22.10.2026)
  2. Electrical Safety First — extension leads, cable reels and block adaptors (retrieved 22.10.2026)
  3. IET — Surge protective devices (retrieved 22.10.2026)
  4. London Fire Brigade — cables, fuses and leads (retrieved 22.10.2026)
  5. OPSS — ETSC extension lead with USB ports, 2105-0126 (retrieved 22.10.2026)
  6. Masterplug — surge warranty (retrieved 22.10.2026)
  7. Belkin UK — BSV400af2M four-outlet surge strip (retrieved 22.10.2026)
  8. BEAMA — extension lead safety check-list (retrieved 22.10.2026)