PC Engine didn't get a UK release, dunno about other European countries, also I don't know if the NTSC/PAL situation is relevant.

Atari 5200 was never released in Europe, so no PAL games.

Sega Nomad is half and half, due to the later 'lock-out'

Some non-Euro systems where PAL is irrelevant:
Bandai WonderSwan
Nintendo Virtual Boy