Years ago gamestation did have import games/consoles but that stopped.
The Japanese box similar from the front but on top when you open the box to get to the machine half the writing is in Japanese and when they look at the manual... well i guess you get the idea.
You do realise that all PS3 games are region free? If you not bothered about UK PS2 games I'd stick with what you got.
If you were going to sell it, ebay or this forum would be your best bet, the only other shop which might help you could be CEX.