Michael Walker (County Mammal Recorder) has produced a provisional atlas of Nottinghamshire Mammal which shows all recording to date.  What is clearly shown is that many of our common species are very poorly recorded in the county so all records would be welcome indeed.   I don’t think House Mouse is one of the rarest species in Notts! The atlas is available from http://www.nottinghamshirewildlife.org/images/uploads/Notts_Mammal_Atlas_2014.pdf