JEP, I've dug out one of our 'Short Term Grazing Let' agreements.
In it, we have the following clauses;
4.2 The Tenant shall not do or suffer to be done on the Holding anything which may be or
become a nuisance or annoyance to the Landlord or the owners or occupiers of any
adjoining land and shall indemnify the Landlord against any claim by third parties in
respect of any breach of this clause.
5 TENANT'S OBLIGATIONS
5.1 The Tenant shall not remove or alter any fence, hedge or other boundary on the
Holding and shall keep all fences, hedges and gates in proper stockproof condition so
as to prevent his stock from straying or being injured and shall indemnify the Landlord
against all costs, claims or demands made by the owners or occupiers of any
adjoining land or any other persons for damages or other money arising from the
escape from the Holding of all or any of the stock placed upon the Holding by the
Tenant.
5.2 The Tenant shall provide the Landlord with a copy of any notice or order affecting the
Holding immediately upon receipt thereof and shall immediately comply with any such
notice or order and shall indemnify the Landlord against all actions, proceedings,
costs, expenses, claims and demands in respect of any matter contravening any
Legal Obligation.
I realise it is a bit late in the day in your case, but may be handy for future reference.