Hello Spydgal & Ros, and thanks for your prompt replies!
Spydgal- It is difficult to get them rotated daily, as you say, due to work commitments, and the fact that trying to get a herd of 8 onto a bare paddock from a lush green one can't be done alone! Needless to say, some of the other owners aren't quite as- (how can I put this without offending any that may be reading this?) 'enthusiastic' or 'obsessive' as me about their horses health! I don't think Pageant is prone to laminitis- no sign of him having had it before I got him a year ago & the only 'warning' I have had is the filled legs- IS that a warning sign for laminitis? I was just going on instinct!
Ros- the electric fence idea is a brilliant one and something I had thought of- unfortunatley I don't have any and my yard manager isn't happy about strip grazing for some reason. So even if I did fork out the couple of hundred quid I'd need to 'strip' it, I don't think she'd let me! Will ask again though because I'd rather spend the money for the sake of all the horses, than risk laminitis.
We had no problems in the spring apart from them being a bit loose for the 24hrs when they first went out- and it's the same field used in rotation. Will certainly be getting a little more assertive about the situation for next spring- or moving him!!