We are in the process of getting some guinea pigs but I am a little worried about the colder weather and how they will cope. The hutch is hopefully large enough for two of them (just over 4foot by 2foot) with a compartment for them to sleep/hide in. I was told that as we live in London they may be ok to remain outside if we cover their cage up when it is rainier/colder and perhaps to use a guinea pig 'hot water bottle' (sorry I have forgotten the actual name of these) but do you think this is ok or should they be brought inside? Obviously if it is snowy I wouldn't keep them outside but if it is rainy or cooler is this ok? Advice welcomed on anything that might help me!