Hunt for any kind of part number or branding on the hinge/track. Then search for any you find. If your lucky you’ll find the manual or parts list and can work it out from there.
Result – managed to get one end of the track down without dislodging the doors.
You can get the kits in Screwfix.
This is the part which had snapped in 2. Not sure if you can see in the pic but there is an ‘H’ in the middle. Bit of googling and its a company called Henderson. Found the part on their website, and it looks like whoever fitted the doors used the wrong kit ie one not designed to carry the weight of glass doors. Rang Hendersons to see if a more heavy duty version would work and they are sending one out free of charge as opposed to £30 ! 🙂
the more heavy duty Hangers have much more plastic reinforcement right where mine has snapped in the middle.