Hello from me in South Lanarkshire

I was looking into getting some geese myself, until I discovered that the recommended stocking is about 6 geese per acre (personally for that much space I'd rather have pigs

) For maximum food production pigs are definately the way to go (but I'm maybe slightly biased

)
I think it's best to have your own CPH and herd numbers - that way you would be contacted if there was ever a problem. The forms are a bit of a nightmare to fill in though and if you're not sure how long this rental is likely to last it'd be easier to use the farmers existing ones (though how legal this is, I'm not sure

)
As for the animals you'd be allowed to keep - I don't think there's any restriction on normal cows, sheep, pigs etc - obviously if you were looking at wild boar (possibly ostritch too

) there is a need for a 'dangerous animal licence'

You'd only need to contact planning if you were putting up any permanent structures (think brick built or having foudations) - movable arcs, field shelters etc should be fine.
Hope this helps and good luck with your venture - keep us posted with how you are getting on.
Karen x