I think I may be able to answer this one.
MSFS uses “official” approach procedures for instrument approaches based on published charts.
If you look at the published ILS approach chart for EGNT (Newcastle) the procedure starts more or less over the airfield at the NT NDB.
In practice the ATC at Newcastle will be providing a “vectors to final” for the approach instead of having the aircraft fly the full procedure.
I suspect that if the radar service at Newcastle were to ever be unavailable then all approaching aircraft would be asked to fly full procedural approaches, which would then mean that they would be flying to the NT NDB before commencing the procedure.
The link for all available aerodrome charts for the UK is:
https://www.aurora.nats.co.uk/htmlAIP/Publications/2022-01-27-AIRAC/html/index-en-GB.html
You can select the relevant airport from the list on the left (AD2 Aerodromes) and then find the relevant instrument charts there.