Libraries currently under threat = 209 plus 7 mobile libraries
Following a suggestion by Tim Coates, the figure includes all libraries that are current under threat. Complete list is under news, with links.  I have taken the worst case scenario when numbers are known but not included a figure if it is just known that a number are under threat but no number is given.

Today’s News
West Midlands – 14 council library services likely to merge in order to cut costs, commenters fear Greater Birmingham – Express & Star
Isle of Wight – more on the dramatic cuts – Isle of Wight Radio
Wirral – “no libraries will close on our watch” – Wirral Globe
Leeds – FOI request shows reason for library closure on shaky ground – Voices for the Library
Hillingdon – record visitor numbers after investment, guarantees of no cuts – Hillingdon and Uxbridge Times