Cannot speak to the UK, but here in the US they have almost no value. I advertised mine at $300, then $200 and got no interest. Ended up giving it away to a chap here on the site for just shipping cost.

My Kit: 861v8+ID41, 800v4, UHD722, MD600, MS600, MS200, Oppo BDP-203, Genesis 201, Genesis 350 SE, Genesis S4-8 Sub, BG 520i, VTL MB450 II, Krell Showcase 7, Genesis 928 Subs, Danley DTS10 sub, SVS Ultra 16 subs.