This is a fantastic deal for a Panasonic TV, let alone a PZ85B which comes Highly Recommended from HDTVtest (http://www.hdtvtest.co.uk/Panasonic-TH42PZ85B/)
Pixmania have it for £770.09, then use discount code Pixuk0913 to receive £25 off, then 4% quidco cashback. Delivery is £19.90.
Richer Sounds have the set at £870 and that's only in selected stores.
I've just taken the plunge after weeks of deliberation, it was just too good an opportunity to pass up.