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How to choose an insect killer

Updated: 22 October 2026

The amazon.co.uk results for an insect killer mix a plug-in lamp, a bottle of bait, a glue ribbon, and a can of spray. This is how to choose an insect killer when you have not yet decided which of those four belongs in a UK home, and when a mains unit may not state a three-pin plug. The twelve listings, from £6.30 to £77.99, are on the [insect killer comparison](/hub/pest-control/insect-killer). Written by the Products Compared editorial team on 21 October 2026 from listings saved on 20 October 2026. No lab test. A qualifying purchase can earn us a commission at no extra cost to you.

The amazon.co.uk results for an insect killer mix a plug-in lamp, a bottle of bait, a glue ribbon, and a can of spray.

Our top picks

Rentokil Rentokil Insectrol, 250 ml

Best overall

Rentokil Rentokil Insectrol, 250 ml
9.6/10about £6.30
View offer
Hefite Hefite UV grid, 20 W

Alternative

Hefite Hefite UV grid, 20 W
7.1/10about £25.99
View offer
Super Ninja Super Ninja fruit fly trap, 2 pack

Best value

Super Ninja Super Ninja fruit fly trap, 2 pack
8.7/10about £9.99
View offer
On this page
  1. 1.Start with the insect and the room
  2. 2.What you are actually buying
  3. 3.UK plug, label, and the numbers that mislead
  4. 4.Which path to take

Start with the insect and the room

Name the insect before the brand. House flies and mosquitoes that move towards a lamp are the case for a UV grid. Fruit flies on a bowl or a bin follow smell, so a lamp is a weak first buy. Crawling insects are a surface spray. House flies that already land are the job for a glue strip. This set has eight grids, one aerosol, two fruit-fly bottles, and 30 ribbons. None is a UV glueboard. Who each row suits is on the best insect killer page. A kitchen can take a bottle by the bin, not a shattering grid over the board. AMUFER claims IPX4. Other outdoor wording has no weather mark saved.

What you are actually buying

A UV grid here is a mains lamp, a mesh, and a tray. Printed wattage runs from 18 W on the AMUFER to 30 W on PlusZap PZ3-30AL. Voltage claims run from 1800 V to 4200 V. Yangor prints 3800 V and no wattage. Glückluz prints 20 W, then a bullet mentions rechargeable while the power field says mains. Super Ninja is £9.99 for two bottles, fruit flies not gnats. TRIITECH is 30 ribbons at £8.58. Rentokil Insectrol is 250 ml at £6.30. Review text names permethrin and d-allethrin, and no HSE number is printed. Grid against ribbon is on electric fly killer vs sticky trap.
Rentokil Rentokil Insectrol, 250 ml

Testsieger

Rentokil Rentokil Insectrol, 250 ml
9.6/10about £6.30
View offer

UK plug, label, and the numbers that mislead

A lead needs a UK plug check. UK mains are 230 V. Regulation 35 expects a standard plug, or a converted plug with a BS 1362 fuse. A UK plug is in the title of the Hefite 20 W unit, the Tmlaibs 20 W unit, and the Hefite 1800 V wall unit. The £77.99 Insect-O-Cutor does not clearly print one. HSE treats a UV fly killer as physical control when it works only by physical means. A spray needs an approved label. Do not call either product HSE approved. Super Ninja prints GB-2026-1354, which these checks did not confirm on a register. Coverage lines include 50 m², 150 m², 160 m², and up to 30 metres. A wall covers less. 4.2 from 14 reviews does not outweigh 4.0 from 1,943. Placement is on how to use an electric fly killer.

Which path to take

Take the spray when the insects crawl, and read the can before you aim it. Do not spray the air of a room. Keep it off a fish tank and uncovered food. Take the bottle for fruit flies, and skip it for gnats or house flies. Take the ribbon for occasional landings and no mains. Take the grid for light-led flies or mosquitoes, on a socket that is not above open food, and only with a stated UK plug if the listing has one.

Common questions

Should I buy a UV grid, a fruit-fly bottle, a ribbon, or a spray?
Match the mechanism to where the insect is. A grid is for house flies or mosquitoes that move towards light, if you can accept a zap and a tray. A Super Ninja bottle is for fruit flies at a fermenting source. A TRIITECH ribbon only catches what lands. Rentokil Insectrol is the indoor aerosol aimed at crawling insects.
Does a plug-in killer need a UK three-pin plug?
Yes, if it has a mains lead. Regulation 35 expects a standard plug, or a proper conversion with a BS 1362 fuse, on domestic equipment. Only three titles in this saved set state a UK plug. The Insect-O-Cutor at £77.99 does not clearly print one. Look at the live photos before you assume the pins will fit a UK socket.
Can I trust a coverage figure in square metres?
Treat it as a seller maximum. This set includes 50 m², 150 m², 160 m², and a 30 metres line that is not an area. None of those was measured for this page. A unit on a wall covers less than a claim written for the middle of a room. If the title and a bullet disagree, believe neither until the live page is consistent.
Does a UV fly killer need an HSE number?
No, when it works only by physical means. HSE uses UV fly killers as an example of products outside biocidal control. A spray needs an approved label. The saved Rentokil listing does not show an HSE number, so you read the statutory box on the can. Do not call either product HSE approved. HSE does not endorse products.
Will a fruit-fly bottle catch gnats or house flies?
The Super Ninja bullets say the trap is for fruit flies and not for gnats. House flies are a different case, and they belong with a grid or a ribbon if they follow light or simply land. A bottle on the windowsill, away from the bowl or the bin, misses the fermenting source. Up to three weeks is a claim on the listing, not a time we measured.

Related pages

Insect killer

Best insect killer UK: match the pick to the insect

Electric fly killer or sticky trap: grid, ribbon, bait

How to use an electric fly killer: place, run, empty

Insect killer for the kitchen, by fly and by siting

Sources

Public UK sources used for this comparison. Shelf prices, stars and review counts are the amazon.co.uk figures captured for these twelve listings. Last checked 20 October 2026.

  1. HSE, biocidal product scope (retrieved 20 October 2026)
  2. HSE, COPR requirements (retrieved 20 October 2026)
  3. HSE, COPR label guidance (retrieved 20 October 2026)
  4. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 20 October 2026)
  5. GOV.UK, Electrical Equipment (Safety) Regulations 2016: Great Britain (retrieved 20 October 2026)
  6. NHS, insect bites and stings (retrieved 20 October 2026)
  7. West Lothian Council, FH08 electronic fly killers (retrieved 20 October 2026)
  8. Cambridge City Council, food hygiene considerations (retrieved 20 October 2026)