sorry, totally forgot about this thread
the castle Castle Bromwich lancs have a marginally more interesting story then most as far as lancaster production batches go...........
The first 200 produced at the factory were originally ordered as Mk.IIs in september 1941, this was changed to Mk.III in February 1943 however they were eventually produced as Mk.Is from October 1943-February 1945
These 200 were issued serials HK535-HK806 (there's more than 200 difference because it was standard practice to miss serial numbers so jerry couldn't find out too much about our production), all lancs up to HK773 had merlin 22 engines, all subsiquent lancs having merlin 24s
The second production batch from Castle Bromwich was for an order of 200 Mk.Is, of which owing to it being the end of the war, only 100 were produced from February 21st- August 22nd 1945, all with merlin 24s and serials PP663-PP918, i hope this's along the lines of what you're after...........