Hi Stig,
I have just found the following.
"The 50 "ex-French" aircraft AR702 to AR751 were delivered directly to the British via Canada between July 1940 and January 1941 with AR720 going to the Admiralty on 28 Oct 1940.
The AR aircraft were originally allocated serials AH205 to AH279 by the BAC in Washington. Those serials were never applied and instead the AR serials were allocated by Air Ministry in London on arrival. The French numbers in the course of delivery were 216-345 and the British took over nos 284 to 345 in the USA. At the time some of these aircraft were already in crates at the French Commission's Weehauken depot awaiting shipment and were purchased directly by the British whilst the rest of the aircraft were still to be completed. However they were supposedly all fitted with British equipment and painted before delivery. The "missing" seven aircraft have never been accounted for.
The aircraft which were on board Jean-Louis Dreyfus (actually in transit to France and diverted to UK) included 26 Marylands from the following batches 235, 237-249, 251-258, 261, 262, 267, 270, 271 and 279-282 but these were all stored crated at Burtonwood after arrival in July 1940 and were eventually allocated serials in the BJ421-BJ428 and BS760-BS777 range. In addition there were 6 "escapers" allocated additional RAF serials".
The full thread can be seen here -
https://www.britmodeller.com/forums/...rtin-maryland/
Alex