That sounds closer to a new price. I got a mint used class 5 head a few years ago for $250au Shipped from usa to Australia. I think they went up in price like everything else. Brit pounds that would be about 130. I'd expect to pay closer to 250 pounds for used but I have no idea of market value over there. I guess check what the new price is and knock at least 100 pounds off that.
Hi.i am going to sell mine so I've been looking around. I'm the UK these ended up being £500 new before being discontinued and i bought mine 2nd hand mint for 295£. 1 year layer here i am selling it and i have seen them go beteen 2-300£ on eBay for the c5- 01 combo upgraded version and 140 170 for the v1&2 combos. Hope this helps