The No4 deliveries timeline makes perfect sense Gil, when you consider the fact that all 1942 and 43 production was required to re-equip the main stream allied armies ( not just re-equip, but also supply the rapidly expanding armed forces of the UKand Canada
), with annual production levels reaching a point in 1944 when ancillary deliveries such as resistance cells in Europe could also be catered for.
It's interesting to note that at least some bayonets were also supplied.