Sorry all, I went to bed!
SK - Thanks for that link, I have Bookmarked it and will have a proper look in a bit.
We graze sheep on the fields, but as we have three fenced, acre, fields, we were going to have the sheep on the "marquee field" for four weeks before the wedding, then movethem onto another field a few days before the wedding...(save grass cutting!)
Just to give an idea, there is a small county lane, which runs perpendicular to our track. Our track is lined with poplar trees and off this track are three fenced fields. The one closest to the lane would be the parking field, then we will decided whether we want the marquee on the middle on or the the furthest field. Past the furthest field in an orchard, big pond, large vegetable plot and the barn.
Joannanicko - Thanks for the reply.
There is no chance of cleaning up the barn, as it is used daily and crammed full of old tractors, agricultural machinery... Even if we could get everything out and spruce it up, there would be no where to house all of the junk inside it! Although I also like the idea of getting hitched in a barn!
Maybe we should also go to viewings at barn venues, so that we have some comparisons.
ByGeorge - Thanks for the reply, too.
It's good to hear advice like yours as you have actually had a marquee and it rained! We too were planning on getting portaloos, but not the ones you get at festivals! More like this.....

Penny Farthing - I like the idea of collecting brollies!
People would park on our land, we would bus everyone to the church. We would get married in the church, then bus everyone back to the land, where they would walk down the 800 yard track and into the marquee.
Thanks all. xxx