Makers of cruciform bladed No. 4 MK. I bayonets?

[CINDERS]

Only Singer were awarded the contract and supplied 75,000 of the Mk 1's the contract was signed on 9th June 1941 but it was certain that the work started before this date Source Skennertons Small Arms Series The British Spike Bayonet (Page - 12) the official approval for the MKI was 15th Nov 1939 (Page - 18) this figure does not include the 1050 trials Cruciforms made for the Mk VI rifle at RSAF (Page - 19)