I'm in dorset and get a bloke in a shed to do them. I think I gave him 4 blades last time, 2 metal cutting chopsaw, 1 wood and 1 circular saw, 45 quid the lot. Think there were about 4 tips on each blade and the rest re-sharpened.
A bit far for me, but knowing a rough price for that work will help when I get some quotes, though to be fair the original blade is going strong after plenty of wood and a fair few metal cuts.