Since the 2003 licensing act there have been no restrictions on children in bars in England and Wales, with 2 exceptions.

   (1) where there is a license which specifically restricts childrens' access (very rare).
   (2) where the landlord states that children aren't allowed (the landlord can disallow who he likes) also quite unusual.

Over the 20 years my session has been running, there have been a number of youngsters, mainly teenagers, in the bar and some have been playing or singing.

The youngest was 1 year old but wqsn't playing an instrument.

:-)