Information and permission about filming location(s)

I will be filming a majority of my film at a farm called Greatworth Hall which is just outside of the village of Greatworth, I have gained permission to film here verbally by asking the manager of the farm if it was possible to shoot my film at their farm. I chose to film at a farm as it is in a secluded area where i will not be disturbed, I will need to conduct a risk assessment of this area for my actors.

Website to the farm: http://www.greatworthhall.com/

The rest of my film will be shot either at my house or my grandfathers so I can operate the camera without any interaction from the public.