Have a look over at AVS forums and I think you will find a few. It seems crazy to me, although in the US I think you get trade-in deals a lot more frequently than over here which makes the move from 3802 to 3803 a little more understandable. To me an upgrade should be a bit more significant than that to be worthwhile.
Depending on your speakers you may find the move from 1 to 3 series worthwhile even with the 3802. Personally I wouldn't bother but by all means demo if you have the chance.
JIT - I have the 1803 and have heard both the 3802 and 3803. The sound quality is basically the same 'type' of sound as the 1803, but better. It's a worthwhile upgrade IMHO - but not at present prices.
If you wait until about May, when the 3803's replacement comes out (3805), the prices of the 3803 will drop to under £500 new.