Maysie, I suppose I was thinking that although we'd buy it together, we'd agree - with some legal document - to split it and make it really clear who owns what. So then if the other couple/person want to move away they could just sell off their bit and me and my partner would be unaffected. You see farms being sold off in lots so I imagine it is possible to split up a farm legally - not sure if you'd have to get planning permission or something for this though, there is alot I don't know about this area so I was wondering if anyone else had tried it.
arobwk - I am looking mainly in the Welsh borders, ie Cheshire, Shropshire etc, but actually I'd go pretty much anywhere if the farm was right!