I would suggest ABS Filament from RS.
I think they sell rebranded Filaments from Dutch Filaments.... Dutch Filaments in return supply Ultimaker as well i guess.... but maybe thats wrong.
However: RS also sell so called M-ABS.... again from Dutch Filaments it's easy to print and more easy to get strong Parts out of, I would prefer it over standard ABS.... but its around in only a few translucent colours