The regional sign thing, made me smile. Many years ago I took my level 2 at Castle College and failed it! I re-sat it, but had to go to Birmingham to do it. During the assessment I made the sign for water, the assesor interrupted me and asked me for clarification as she had not seen this sign before! It transpired that the Birmingham sign for water, is totally different to the Sheffield one I had been taught! Fortunately, one of the requirements for Level 2 BSL is an understanding of regional differences and I passed my exam.