Fireline,
With the 2 sightings from John H-T from above, I decided to have a quick squizz at a few magazines for you, with the following results:
Between me and John H-T, we've seen 15 different T9s in BR times.
Of these, 5 have 6-wheel tenders : 30301 (wide cab, J H-T); 30304 (wide cab, SD 4/93); 30313 (wide cab, SD 1/95); 30726 (narrow cab, J H-T); 30729 (narrow cab, 1957 CV).
SD = Steam Days, CV combined volume.
You cannot make further asssumptions with this data, e.g. well if 30301, 30304 and 30313 had 6-wheel tenders, 30310 must have too - wrong, 30310 had 8- wheel tender in SD 11/91 !
Photos of locos with 8-wheelers include 30117

, 30120

, 30310(w), 30338(w), 30708

, 30709 (n, 2), 30712

, 30715

, 30717

, 30719

.
For which type of 6-wheeler, see comment above, I'd see if anyone can come up with a mid-50's locoshed book and check the allocations for a start.
Excuse me, I will now remove my anorak....
6991