As far as I know employee protection law, at least in the UK, doesn't like these post-contractual obligations. I would ask a lawyer specialising in employment l

As far as I know employee protection law, at least in the UK, doesn't like these post-contractual obligations. I would ask a lawyer specialising in employment law for confirmation but it is my understanding that you are under no obligation whatsoever to sign this and should they ever do anything that detriments future employment you would have grounds to sue.