Thank you for all the input - I think it was an old cowboy movie that put me off barbed wire when I was about 10, the baddies wrapped someone up in the stuff - anyway - bit's are ordered and on their way, could get locally but at twice the cost!! We have had no problems with any of the other fencing, no jumping over - I really think they are just taking advantage of the weak bit of fencing - won't be cutting any more fencing ever, even with 'head in fence' incidents I've now got the technique to get them out - but get a dirty look afterwards like it's my fault!!!