Hi!
Thanks for the update. I think pics would be an absolute essential first stage in getting anywhere near an identification. This is such an unusual record (in fact unique) in Britain that we obviously need to exercise some caution. If you could get some pics they should be recognisable, and then I might be able to suggest an expert from your area goes to have a look. BWARS (
BWARS Home Page) has several active members in the Leicester area, and also the former Chairman of the Society who lives in Loughborough.
With best wishes, Stuart