Hi, BSL and ASL have a few differences example alphabet signed on one hand for ASL and both hands for BSL.. Signs are different however overall the structure is the same for both languages. It's difficult in learning and understanding sign. hearing people have their own terminology for explaining things and using slang words well it's the same in deaf culture (correct me if I'm wrong)
It can be quite overwhelming of to much of the same information with different formats I live in England and here we have different signs in different towns just a few miles away from each other.. Manchester, Leeds, Birmingham and London etc this is found all over the world.
You should learn sign?