Don't hold your breath too much on newish R44s in the UK.
A reasonably equipped new R44 Raven II ordered in December 2007 before the Jan and July price rises and delivered in mid 2008 would have cost the buyer about $425k including shipping. In mid 2008 at near $1.98 to the £ when the helicopter had to be paid for, that meant it would have cost about £215k + VAT + some UK costs.
Cost new has now gone up by $25k (2x $12.5k price rises), so it is $450k.
However factor in the $/£ exchange rate today at $1.69, and a new one will cost you £265k + VAT + UK costs.
In other words, a zero hour R44 ordered now costs £50k+VAT more than it did 10 months ago.
No guarantee of support when a lot of R44s are around for sale, but for nearly new, the comparison with new prices is going to provide a lot of support for second hand values.
BW