Hi Chris I have just researched field and common voles on the net and think that you are probably right - and I also think we have both types, down to the different habitats. We do have owls, cats, hawks/kestrels (don't know the difference!) and probably other predators, so I am quite happy to leave this food source for them. Now we have cleared most of the area of the dense undergrowth and are mowing both habitat areas regularly with a noisy tractor mower, I think that they may move on - but no problems either way! Thay you all for your help, opinions and advice! ...and any advice we may be able to give re: fosse septiques, STP's etc..... Best regards