Unfortunately it looks like UK prices are still at a low, I had hoped they were beginning to rise again but with prices as stated above I'm not so sure.
EU prices seem to have dropped a little since beginning of year but not to the same degree as UK prices.
Although the Mathewson's m3w looked nice - did it have the Centa upgrade (as not stated in the auction blub) and was it stage 3 or just stage 2 (I ask as their is currently an m3w on Autotrader that states it has a stage 3 but in fact its only a stage 2 tune - paperwork was incorrect).
And Car & Classic sold an early car last month - lower mileage and main dealer history (although that does not imply it has a Centa drive) that also sold for £20.5k plus fees. (appeared on Ebay a week later for £25k...)
I hope that as these are such a unique vehicle, prices will start to climb next year(?) as people start to appreciate the fact that there will never be anything like it produced again.