Not my area of expertise, but I would say you have a couple worth a pounds (such as Logray, Weequay and maybe the super thin trilogo Bossk?) and then the majority around £4-£8 with some of the best and/or most desirable ones from £10 up. Stuff like Boba Fett and Yak Face are going to be the highest in demand I guess (£15-£20?) but I also rate those tidy Last 17 like Warok, Romba and Han Carbonite. I don't know what they'd be worth but I'd guess anywhere between £10-£15 each? These last three I would certainly be interested in, along with the ERG, if you do come to sell.