From the photos I have gleaned from interweb it was indeed No 20 Galtee More.
There was also one of the earlier Vulcan 240's, No 29 the 040st and at least one 044t, Castle Hacket? I think.
and an unknown 060
Samples cropped frrom photos from the internet.
Copyright with respective owners.
Also
We must not forget Killaney by David Walker.
November 1985 Railway Modeller.
Four locos, 242t No14 Lough Derg, Fairburn 240 No11 and 440 No54 Jubilee and 040st No29 again.
The same article also mentions a "superb tender drawing for Jubilee in the "Railway Engineer".
I have not yet found that online but I will keep looking.
Edit. That 060 may be an Avonside 042?
Rob