I was on an Gateshead bound service that was diverted via the Tyne Bridge. (It was a 21). Coming down the Bigg Market the NSAs had obviously announced the next stop was High Level Bridge North, however being on diversion and turning left onto Mosley St we never reached High Level Bridge North.
If it had been London, the clever iBus system would have been utilised to announce something on the lines of 'This bus is on diversion, please listen for further announcements'. Not being as intelligent though there was no such information given here, (and I didn't hear my driver announce the diversion either) - not great for blind/visually impaired or people unfamiliar with the route/area. Anyway I take it theres no option for our drivers to play pre-recorded announcements in such circumstances?
Is this because our announcements are linked to the destination selected and will only play recordings for that route?
(So if a bus diverts away from the route it'll just not play anything until the bus rejoins the usual route and the NSAs will suddenly catch up?)
I also wondered what happens when services to Newcastle are terminated early at Gateshead due to congestion in Newcastle etc. Is anything altered then or does the bus continue to announce it's going to Newcastle, or if the driver is aware of the short service before reaching Gateshead, is there Gateshead destination screens available & the relevant NSAs linked for those eventualities?

Just curious. Sorry for the hundred questions.