Hi again Jazz. Just for information for others who haven't seen the original post viewtopic.php?f=1&t=25660&start=0
In answer to this query, "So the question is if the health and safety risk assessment test has picked up an issue with the boundary fence is the club still allowed to use the grounds?"
If the club have picked up something from their risk assessment that requires new measures, then the simple answer to your first question is yes they are still allowed to use the grounds unless of course what they found would be life-threatening, then it perhaps wouldn't be advisable in case of a court case.
They are most probably trying to find a "reasonable" adjustment to the problem thus you have not heard anything from them.
As for your second query regarding reporting to the HSE, I personally would take the advice of Kev on your original post first and put everything in writing to the departments he suggests as your next move.
Sorry I can't be of much help with this Jazz. I really do think Kev's suggestion is the best way forward now.
Good luck to you.