Ok kool.cheers for all your advice guys.im fitting my new ngk ntk 660mm lambda sensor tomoz.it cost 65 from motor parts direct same day.ordered in morning collected in evening
i hope it solves the power issues.fingers crossed.
by the way,i had to drop cat from manifold so i could twist it to get lambda out.not an easy job.too be honest every job on an old car where everythings rusted tight.aint easy lol