If...
Sorry, some statistics on the Avro Lancaster bomber.
At 1941 delivered 10 Lancasters (AVRO at Manchester).
At 1942 delivered 688 Lancasters (AVRO at Manchester and Yeadon 516 a/c, Metropolitan-Vickers at Manchester 142 a/c, Armstrong-Whitworth at Coventry 30).
Jan 1942 delivered 12 Lancasters, Dec 1942 109 Lancasters.
At 1942 lost 227 Lancasters with Bomber Command (operational) squadrons (12 Lancasters No 1 Group - 9 operational losses, 3 non-op; No 5 Group - 203 Lancaster lost, 177 lost at ops, 26 non-op losses; No 8 PFF Group - 12 aircrafts, 10 ops, 2 non/op; Bomber Command squadrons), plus 9 (Conversion Flights and Conversion Units). 1941 losses: nil.
Lancaster Squadrons (1942):
No 1 Group - 101 Squadron, 103 Squadron, 460 Squadron.
No 5 Group - 9, 44, 49, 50, 57, 61, 83 (15 Aug 1942 transferred to PFF), 97, 106, 207.
No 8 PFF Group - 83 Squadron.
(13 Bomber Command Squadrons - with two operational flights, theoretically, about 260 Lancasters at Squadrons at end of this year? At end of this year Lancaster also with 1654, 1660 and 1661 Conversion Units. And many Lancs also tested with A&AEE and other units.)
And between June to August 1942 small detachment (from 44, 50 and 61 Squadron) transferred to Coastal Command, Nutts Corner and St. Eval airfield. (Single U-Boat "kill" - U 751, 17 July 1942.)