Just a heads up, was in Sainsbury's earlier and spotted these bicycle helmets at half price. Various sizes available for adults and kids.
Maybe the fanatic out there will complain that the air vents are not earodynamic enough, but if you want the protection at a reasonable price, I say you can't go wrong.
Very similar design is retailing at local bike shop for £30.
There seems to be a big shortage of good deals on bicycle gear (locks, clothing, etc)...paying £80 for a lock doesn't seem right!!!