Unfortunately I haven't got sufficient up votes for all of you who have responded above. The information is extremely useful to me.
The above said, there is now a fly in the ointment. I mentioned to my wife, brother and mate, earlier that I had posted a request on efests about getting a suitable venue for my 60th. I also indicated that if any people on this planet that could guide on this one, that it would be all the folk on here. It was then that I was made aware of 'secret' already concluded preparations for my 60th.
I am still very grateful for the suggestions made, and also still welcome any others. I say this because the suggestions so far are drool inducing. So much so that I may have to set up a rival camp for my 60th celebrations. I mean 'who's f'ing birthday is it anyway'!? lol I don't really mean that. I don't actually like celebrating birthdays, but 'experienced' what my wife achieved for my 50th, so thought it would be good to repeat it for next year' s 60th. That said, there's friends I have who have never been to a festival, and really ought to go before it's too late, and 'forcing' them to may be the only 'decent' thing to do. Mind you, that's all a bit fascist too, which is not to my liking.
Anyway, I've had a smoke and sense hat I may be flying off on tangents.
Thanks once again to those above. You may 'win' the day yet.