So there have been a couple more escapes, but just the odd once here and there. My additional fence inside of the original inside fence seems to have thwarted him somewhat as every time he's been stuck on the new 'inside track' not actually loose in the middle of the tracks, so a partial win I guess, and at least he can't give me such a run around in there
I've been strip grazing the new inside track to get the long grass off it, hopefully once it's right down then he will give up as it won't be so appealing to get in there