Ron, C1800, thank you both again. Your patience is greatly appreciated! The damaged screw was the lower one you loosen to allow the TPS to revolve for adjustment as described in the article you attached. I'm lucky to live in Thorndon, Suffolk where a lovely fellow called Rob, who restored Amazon's has his workshop (his father, Tony is also a big Volvo man I hear), and he managed to extract the screw, so I'm away to the races! Let's see if I can get this puppy running perfectly!
Thanks for the advice on the TPS, Rob thought it looked pretty good inside, so I'll give it another clean and see how we go.
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