Cuckoo in North of Scotland?

Hi - Can anyone tell me if I am going cuckoo or could I have heard a cuckoo where I live? I don't think I have ever heard one before, but I have heard him cuckoo-ing away good style for over a week. Seems to be coming from an area of rough grazing / gorse and heather scrub land. There are NO trees anywhere near - it is the sort of area where lapwings and curlews nest. Is it possible?

Keith in Caithness - keen to learn more about birds!