[Graham Boak]

There is a heritage group at Warton, headed (I think) by Tony Wilson, who may well have production records of the EE Halifaxes. Although the construction numbers may not follow in exact sequence with the serials, they will have been linked in the records, and certainly you should be able to refine the search to a fairly small number of possibilities. Another useful piece of information is that Mod.194 was the last incorporated on the production at that time.