It would appear that it was not a nuisance until Travelodge moved in next door, Richard.

If the pub was already advertising DJs in the garden, surely that should have put Travelodge on notice that this would not be a quiet enough location for some of their more sensitive guests.

Pubs have a tendency to be noisy, whether from loud music, noisy televisions or just very rowdy customers. This pub was there first - Travelodge should have been aware of the problem and either not have moved there or should have ensured that they built to allow for the existing conditions.