In reply to owena: I think between you all youve worked out what I mean, I wasnt expecting such a good response and so quickly - just been for a run up Moelwyn Mawr so only checking my replies now!
I understand what you mean and agree that it would be an odd direction if partner did take a fall, and yes I get what you mean by the 'lead' being too long if its getting under the feet.
Thanks all, I know its an obvious answer to some of you but common sense isnt always that common