POI files synced with MyDrive will not delete from GO 610
Easy fix in the end - for some reason, TomTom requires you to login on the software on the computer and the My Drive internet site and also... the TomTom itself. For some reason, the TomTom had logged itself out of My Drive and I needed to put the password into the TomTom (satnav) again. It was updating speed cameras and the maps automatically but would not synchronise with My Drive. Bloody annoying. Hope this helps anybody else in the same situation.