Can anybody name the connection

[rpm]

Short story, council bathroom refit 8 days ago then blockage occured outside on a branch between this toilet and the mains resulting in this joint leaking when the water backed up. Any glaring errors here?
Thanks.

 

[ShaunCorbs]

Yes need to remove the cast/ clay collar or push the bent pan connector further down eg into the smaller dia and not in the collar

 

[Deleted member 120897]

The use of x2 multikwik’s/pan connectors, without sleeving? Looks loose in the straight connector too.

 

[JusKel]

90 degree multiwick connected to straight multiwick connected to cast pipe collar. Might just need to slide the 90's seal back up so that it seals around the straights seal ( the gap near your arrow)