Name2key
From OSGrid.org
to use name to key URL
http://name2key.osgrid.org/?name=Nebadon%20Tester
this will return users UUID
check last time user has logged in
http://name2key.osgrid.org/last.php?uid=72e14a52-e421-4e03-8e6f-5f947a04fd86
this will return the date and time of last time this user has logged in