Many thanks for the replies.
Cost if wasted fuel included over £300. Ouch!
Tank and fuel lines have now been cleared. It did start this morning, very reluctantly, and poured out smoke until the carbs cleared. Having run it on the drive for a bit, its still smoking a little, but seems to be OK. Will take for a proper run later.
The pumped out fuel is taken to a central processing plant in Sheffield and turned into an industrial degreasing product. AA man said he had done six incidents on Saturday. While he was here one of my neighbours owned up to doing the same thing recently, fortunately he realised before he started his car.
ADDED. Have now refuelled with correct diet of Vpower Unleaded and done a few miles. Car going well and smoking has now stopped. Fingers crossed no damage other than to my wallet.
Andy