Nah they're the same type - herring gulls .
They have just adapted to the times & are opportunists as they always were, but as people keep feeding them on the prom, they see any food displayed as a meal.
Its not the fault of the gulls - - Its the people that feed them that are at fault.
Examples : St Ives Cornwall - - They had BIG probs with seagulls pinching any food in sight. - - they made it an offence to feed them. The seagull numbers have now declined & the remaining ones are not quite as opportunist as the Llandudno ones.
Whitby north Yorkshire. Again feeding the gulls is a no-no. A portion of fish & chips can be eaten on the quayside without much risk of gull attack.
LLandudno has not had as much problem with gulls as these places as they are both fishing ports - so if a no feeding policy was put into place & more importantly reinforced then surely the problem would be minimised.
Personally, I like the gulls, so in my opinion I would say leave them be - Its nice to be woken by the birds, even if it is 4am in the morn!!!
If you live in the country the birds are awake & loud at 4am, & can still be vocal throughout the night.
CCBC Need to enforce a no feeding policy throughout the borough then in the whole this prob will be solved.