Thanks for all of your responses and advice, so for taking so long in getting back to you all.
Well I headed your advice, and even suffering with bronchitis, we managed to block off the second section of field with gates. Believe me, it was some huge job, but I believe sooo worth it.
Our new little mare, Saffy, arrived safe and calm, and we gave her time to explore both fields as eventually they will be one big field. We then gave her the second half, and brought my gelding down.
He was very excited as he has been on his own for a few months, I know dont hate me, but we had no choice but to have him on his own.
Initially there was a lot of whinning going on, and both chasing each other up the line of the fence, but settled down very quickly. No hoof strikes through the fencing, a small amount of nipping, but all well on the first day.
Today I have been over several times, and I may be reading this wrong, but they seem to not want to leave each other. There is no whinning, they are rubbing heads through the fence and grazing either side within 10ft. If one moves off the other follows. There is no nastiness about either of them towards each other, well one bite from the mare, and the gelding backed off.
Its been suggested that I leave them like this for 2 wks?
Either they are dying to kill each other, so wont move off, or they really do want to be together. I am actually confused, as its the first time I have had to introduce horses. What do I need to look for?
I have pictures of them together if it helps. Thanks you x