Prowell F59R Vipor Cycle Helmet with free SharkFin Light (helmet or bike mountable - worth £5.49).
Never heard of this manufacturer but reviews appear good (approx. 4.5 stars from 38 posts). Nice range of colours. Umm, that's it really, it's a helmet! :-)
Edit: Amazon now says it was £69.99 before so I've changed the title to reflect that.
OK here's some filler blurb:
We strongly believe that our bicycle helmets are the safest on the market today due to the material used to produce the helmets. Prowell helmets are made from EPU material often used in bumpers of German manufactured vehicles. The vast majority of other bicycle helmets on the market are made from EPS material which is effectively thousands of polystyrene beads glued together. Prowell Helmets offer the 1st and only "DUAL-DENSITY" structure which means that the outer shell of the helmet has a harder density to resist and distribute any impact to a wider area. The soft inner density then absorbs the shock energy.