Please find below a selection of links that may be of use to you...
The British Horse Society
Represents and promotes horse riding in the U.K. and abroad, including
training, welfare, safety, and career qualifications.
The British Showjumping
The BSJA is the governing body of show jumping in Great Britain,
formulating the rules and codes of practice under which all affiliated
competitions are held.
For information regarding eventing in the UK.
Stud & AI Centre