Itson...
When we did FPRSA/HCS/9020D [call it what you will] at Manchester. We did let the various Towers/Sectors know [by 'phone] ASAP about any "Changes/Reroutes etc".
However, due to "various" reasons...our "task" has been transferred to Scottish.... In their defence......They don't know Manch [area] routes and they don't seem to have the staff to "rapidly modify FPLs" let alone telephone the ATSU with a "Change"....
watp,iktch