There is endless amounts of information about swimming on the internet, the following sites could be useful to you:
British Swimming
The Amateur Swimming Association (ASA)
The Institute of Swimming (IoS)
Swim 21
The ASA – North East Region
Northumberland & Durham Swimming Association
Borough of Stockton Swim Scheme (BOSSS)
Tees Active
Event Photography North East
Simply Swim – 10% off for Stockton ASC members
by using voucher code SVC22 at the checkout
Simply Swim
Competition swimwear