LDN: Heritage RMs on route 25

On Monday, there was a strike by station staff of the London Underground system, and some stations were closed.

to cope with extra demand, 4 of the 5 RMs , run by Stagecoach on route 15, were used in the am peak on journies into the centre.
RM324 1968 2050 and 2071 were used, and here is RM2071 at Mile end gate.

regards

Yoram

The RM wins again. :

But why does the bus have full blind of 25?  Does Stagecoach always have a plan to farewell Rt 25 in future? #???