Will definitely try the vinegar trick but as for tasty snacks, here's the setup:
They come down in the evenings and sit on a nice carpet in front of our (filled in) fireplace... which is what they chew. They get fed there (veggies usually) and we usually throw down kitchen roll tubes etc which they promptly destroy... so they have plenty of distractions (I've given them fruit tree branches too which they chew at) it's just Jack seems to love chewing the walls!!!!!
Anyway, like I say will try the vinegar trick, nd thanks for your comments guys, will keep distracting her!
xxx