A Johnson 2F 0-6-0 or a Stanier 2-6-2T please.
The Johnson 2F could be as big a minefield as the Dean Goods due to its life of over 80 years. so they may wish to steer clear.
The Stanier 2-6-2T on the other hand shares the same wheel sizes and spacings as the previous Fowler version. Start with the standard boiler Stanier with dome and topfeed, then continue with combined dome/topfeed, domeless. and the larger boiler carried by four locos. For the Fowler you have the standard boiler, with and without Pull-Push gear and 20 conderser fitted locos.
The Fowler locos were built between 1930 and 1932, originally carrying number 15500 - 15569 then being renumbered 1 - 70. Going into BR they got mixed traffic livery early/late, but on the way some were plain black with BRITISH RAILWAYS and at least 40070 had the BR number applied to its LMS livery in LMS-style figures.
Stanier locos numbered 71 - 209 were added from 1935 to 1938.
As far as distribution is concerned, between them they got virtually everywhere that the LMS reached, with pictures in London including the Widened Lines, Hither Green and Clapham Junction, Bath Green Park, Bristol, Swansea, North Wales, Leeds and the far north of Scotland.
So we end up with at least seven potential body variations and plenty of potential liveries across a group of 209 locos with a life span of 25 - 32 years and a wide operating area.