Question Author
Thanks for all your answers.
We do use a water pistol which scares them off, but they keep coming back.
They just climb up the fence and drop down into our garden, so that obviously doesn't stop them, we do have a gap in the fence but that is so the hedgehog that frequents our garden can come and go.
She has stood up for herself on occasions, but they got the better of the little lamb at the weekend.
I think we'll have to enrol her in kick boxing classes so she can confidently kick some butt!!!