$250?!? For a complete A2000 setup? Holy moley are currencies and supply totally different between these two countries. In the States, we can pick up A2000's all day long for about $50. Then add accelerator, graphics, ram , etc. cards to that...
The 2000 didn't sell that well in the UK, where the 500 and 1200 were king. The 2000 is far more common in the US, and in Germany too - where apparantly it sold way more than the 1200.
So even a totally standard not great condition 2000 will fetch over £50 in the UK