Just came across this company below called 'Monster Colours' They're a U.K tailored brand of spraypaint designed around street art and graffiti established in 2003. In comparison to brands like montana and Belton I haven't heard of them before but from their videos they seem to make some high quality paint.
'Monster colors prides itself on being the only 100% UK owned aerosol
art paint manufacturer - we put back into the u.k scene what we take
out, sponsoring events, youth art groups, county councils, local
authorities and writers up & down the country.'
Seen as they