Red tarmac has the same legal status as the grey stuff. Idea is to "catch your attention", like on the approach to pedestrian crossings, inside bus lanes, etc. Watch out for them adding white bits - the white bits mean things. All covered in the Highway Code.
its got rubber beads bound into the tarmac.....masively increases grip....they're sticking it all voer the palce at the moment....excellent idea if you ask me.... did cost 70 quid a square meter mind....