I bought my first PC Engine from Mr Disk in Birmingham in 1989. I think it was about £200 plus another £30 for a pal booster because I never had a scart telly. I got Kato & Ken and Bikkuriman World with it although the obvious choice was R-Type.
I used to buy most of my games from Console Concepts in Stoke (I'm pretty sure they were called PC Engine supplies at the time.
so it seems Mr Disk did sell imports, i wasn't sure, i do recall amiga demos/pds and a vaguely seen a a few imports
console concepts ( stated off as pc engine supplies, only know this as i seen old advert and has same address as pc engine supplies,) then closed, i vaguely recall console concepts still there in 1997, but closed in 1998, then apparently they partnered with another world in stoke and continued selling import games, bizarre thing, there expanded their selection with japanese only rpg which no one buys apart from half japanese friend who studied at studied at staffordshire uni