I seem to remember a few 'grapes' having problems with mice in polytunnels & sheds & wondering if you could get battery operated sonic mouse repellers. I spotted an ad. for this very thing in a garden mag. & newspaper this week from a company called Windsor Products for about £20. The device has adjustable settings so that it can work for anything from mice to badgers. Don't know if it works but I'll put a link here for anyone who wants to look.
www.windsorproductssecure.co.uk/windsor/shop/catalogView2.jsp
www.windsorproductssecure.co.uk/windsor/shop/catalogView2.jsp
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