It would appear I've lead you up the garden path- apologies! Yes there was crud in the air cleaner housing. The filter/plugs/leads/dizzy etc even the coil were all changed with spares I had from an acclaim I broke a few years back.. However, have just noticed hissing (air drawn in) around offside carb so I'm thinking vacuum pipe/gasket? Would certainly explain bad starting/crap idle! Nothing to do with taking the car for a swim, but then my life is punctuated with unfortunate coincidences.... Thanks for all the replies I'll try & look at it at the w/end ;-)