paul russells LED Golf Ball Dimmable Edison Screw Light, 5.5W 470LM E27 G45 LED Bulb (w/voucher) Sold & Shipped by Barkley Trading

Useful if you need a small E27 golf-ball bulb rather than the usual larger shape. Its dimmable, uses just 5.5W and puts out 470 lumens, roughly equivalent to an old 40W bulb.
There are both warm white and daylight versions available at the same price with the voucher, so you can pick whichever suits the room rather than being stuck with one colour temperature.
Could be handy for lamps, ceiling fittings or anywhere you want a compact bulb that still gives a decent amount of light.