Having written my negative review I was swiftly contacted by a partner of the Grantown site to apologise unreservedly for our experience and say that in future this situation should never arise again, for anyone. Sandra's email was very sincere and has undoubtedly left me with a much warmer feeling - to the point that when we next return to visit our friends in Scotland we will definitely give it another go. Although this will probably not be until next Spring, I will of course update my review afterwards and am quietly confident it will be much more positive. So, in all, it looks like I will be back!