Cardiff has an A320 based for 4 days a week this winter and it then generally goes to Leeds for the rest of the week.
Bristol has a permanently based A320.
Gatwick has just 1 x A321 based for the winter and no A320's.
As for the winglets....They cannot be added on to the B757's due to their leases and the costs involved wouldn't make themn viable before their leases ran out - so in short - No TCX winglets on their current 757's