thank you for that advice and I have started tying her up now when the lambs are out.
We have a small paddock out the front of the house and as I am off work at present I am here all day so can keep an eye on them.
all my other ewes have lambed during the day and once one lambed all the other ewes are let out of the paddock onto our hayfield, just so mum and baby can have 12 hours alone. This has seemed to work well, however, This particular ewe, who is a complete nutter, and will probably be gone by the end of the year, lambed at midnight and as all the other ewes were settled and quiet I thought it would be ok to leave her where she was.
Perhaps in hindsight I should have taken to the barn then.
I will definitely try the treacle trick and see if it helps.
thanks again.