the rings cost me £100 a mate did the deed cost me £220 labour then when we picked it up about an hour later something got stuck in the bottom pulley and shredded the alternator belt wrapped it round crankshaft pulley , in turn stopped the bottom end and typical the timing belt slipped a couple of teeth and 16 bent valves , so that was another £200 ish to have repaired , but he did change the stem seals at the same time as the rings . but i,m glad to say all is well now .