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Any of the Cuts from the Chuck will work, Look for Roasts or cuts at least 5cm thick or more. Short Ribs are great as well. Below is a list of common UK cut names. There is a UK Group, lots of guys there to help...JJ
Whole chuck is nice smoked and a lot more forgiving than brisket. Or picanha which you can now get it in Waitrose; it's a Brazilian cut (no not that type of Brazilian cut)