Regarding something else.
To best of my knowledge the shortlist of spare diesels in 2027 or 2028 is :
150 from Wales (but will be 40 years old)
153 (many currently stored)
156 (only handful, and not operational, I think they are at Ely)
158 (not clear how long Wales wants to keep them)
180 (10 with Grand Central, 4 stored, GC replacing theirs 2028)
196 (Chiltern have 6, never put into service, scheduled for EWR)
221 (6 sets ex Avanti still stored, 2 sets with Grand Central until 2028)
222 (Lumo getting some, Scotrail aiming for some, but unclear if they can still be outbid or have definitely secured them)
Loco hauled (eg 67 + mk3s ex Chiltern), but some nearer 45 years old
Not really anything else available if want extra diesel trains