Thats great - thanks for the suggestions that's exactly the kind of things needed. It'll just be to keep an expanding flock of ewes in, no rams they will be safely elsewhere. Only Southdowns at the mo but branching out next year although we'll have nothing horned.
Main concern was the horses safety as they're not ours and they're working horses.
Brilliant, thanks again - the Internet is so overwhelming, I didn't know where to start but you all have so much experience and knowledge thanks all.