For a £250 a pair, they sound pretty good and quite "smooth". I heard them in Richersounds with a PM/CD6004 combo. Though if you were looking at the RX6 they would be a step down in overall SQ IMO. That said, the tannoy DCT6 are on offer for a bit less than the RX6 in Richersounds at the moment. They are probably an "equivilent" speaker in terms of the brands respective ranges.
http://www.whathifi.com/review/tannoy-revolution-dc6t
http://www.richersounds.com/product/floorstanders/tannoy/revolution-dc6t/tann-revo-dc6t-espr
Though said that, I'd be wanting to give it better amplification than a PM6004.