Ok, had a good look at the HMV sheet, Broadcaster service man's, July 1938. Its drawn in a different way. Got this from Electrotanya.
C26 is a decoupling cap.
C25 is the bias rail reservoir- -HT
Speaker coil is smoothing choke
C24 & C28 are the smoothing cap
There appears to be no specific +HT reservoir cap, perhaps because the rectifier was rated for a very low value anyway and there are several smoothers and decouplers on the HT rail.
It is a somewhat unusual circuit and layout, got me confused
The Marconi diagram is one first look the same but drawn upside down to my way.