Pavlov, the type of helmet you are looking for is for BMX or downhill MTB, not usually used with younger children to be honest.
The child who had the accident was extremely unlucky, it must have been a very bad accidnet to split a helmet at the front, unless it already had damage? (perhaps dropped or crushed with an internal crack)
All standard helmets are built to protect to high standards if bought from reputable sources. There is usually a thickness sufficient to stop the face hitting the ground as the helmet will hit the ground instead if that makes sense. This is especially true of helmets for standard MTB as they have peaks attached.
We got a basic styrofoam one from Argos; good enough for the sort of use you do. You can spend 85 quid and get a proper hard plastic fully padded one suitable for BMX racing, but I venture that might be OTT.
My DD is learning to ride. 2 goes on her new bike, and she is almost riding it.
A child I know fell off a few weeks back, over handlebars, smashed his open-faced helmet completely at the front, broke his nose and split his lip (5yo).A&E advised the parents of the little boy who broke his nose to get a full faced helmet. DD is likely to want to ride rough and fast and I am worried about this happening to her so want to get her a full face helmet too.
All of them appear to be for older children, and all black and grey. Does anyone know where I can buy one that is at least neutral/white or just plain black if not girly so we can put stickers on?