Would you say the same if he was buying a similar bat from a forum sponsor? If EAS is providing the warranty, then there shouldn’t be an issue.
In fairness, they wouldn't be a forum sponsor if they were importing bats intended for a different market.
With regards to the OP, at the end of the day the bat will be made in the same factory so the chances are it'll be no different except for a minor British flag sticker. If you want piece of mind with an actual BAS warranty, then use an approved dealer. If not then other means of attaining a BAS bat exist, such as EAS.
Personally I'd steer clear of anyone who isn't an approved dealer, but that's just my own personal preference as I like that piece of mind!