Thanks iadom, I knew you would drop in, I've replied to your pm
Just to let everyone else know, the defrost seems to be doing the trick, a layer of frost / ice is building on the backplate, but it's slow, I'll see how it goes overnight, failing that, iadom has given me a link to try, if that does not yeild a result then a new fridge freezer it is
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Thanks to all for trying to help, I thank you, my beers thank you, and the gf''s vodka thanks you
Thanks