If it is a Hyndburn Council owned allottment you should tell them that it is neglected and unused.
The council will advise the tenant to use it or lose it, and let it to someone who will.
At present all Hyndburn council allottments are having a revamp which includes secure fencing.
This site includes access to maps showing where the allottments are
Allotments - Allotments in Hyndburn