Hi.

You will either need an adaptor which will reduce the 230V down to 110V and the frequency from 60Hz down to 50Hz. These adaptors are quite readily avaliable from electronics shops, but I can't recomend any personally as I have never used one.

Alternatively you could find a replacement PSU for the A2000 (a UK one).

I'm not familiar with big box amigas. I'm assuming the power supply doesn't have a switch to select which voltage you are using. I don't know how easy it would be to get a replacement A2000 power supply, but if you can't get one, you could possibly modify an ATX one.

(I would recomend the replacement PSU over the US->UK adaptor if possible)