Well this is interesting:
A hanful of D trains will be appearing, a few 170s, and the MK4s.
Plenty of new build, and 150s soldiering on until 2023, with 158s and 175s going by end of 2022. Additional 153s being sourced ASAP as well.
A slightly clearer copy of this chart has emerged here

A hanful of D trains will be appearing, a few 170s, and the MK4s.
Plenty of new build, and 150s soldiering on until 2023, with 158s and 175s going by end of 2022. Additional 153s being sourced ASAP as well.
A slightly clearer copy of this chart has emerged here
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