British Sign Language is a visual means of communicating using gestures, facial expression and body language with its own vocabulary, grammar and syntax. It is not dependent upon or related to English and is used mainly by people who are Deaf or to support those who have a hearing loss.
Similarly, to spoken language, there are regional variations. For example, the sign for ‘holiday’ which has around 10 -12 sign variations is dependent upon the area of the UK that you are in.