My book says: 92020 to 92029 were introduced in 1955 and fitted with Crosti boilers.
Wellingborough 15A, Kettering 15B, Leicester 15c, Coalville 15D, Leicester (GC) 15E, Market Harborough Seaton 15F. (These lists include alterations brought about or proposed by the regional boundary changes of February 1st 1958, as far as at present known and are subject to amendment) (If that's any use.)
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