From the database I've counted 136 Monotype Mk2s and 160 Enfield DDs, obviously there will be many moe out there but on average it appears there are more DD guns left in existence.
Unfortunatly the figure of '26,000 guns of 30,000 left behind at Dunkirque' is used out of context alot. There were 26,000 odd Brens left behind, by the time of the evacuation, but Enfield produced a further 4,500 true Mk1s with the crown, a further 7,000 true Mk1s with the ED logo and then another 8,200 simplified bodies which retained the second dovetail. In total approx 50,000 DD Enfield Brens were produced, 26,000 were lost leaving 24,000 still in service by the end of 1940.
Obviously that means that Monotype produced 23,000 more Mk2s than Enfield produced of the Mk1 DD, and with 26,000 Mk1 DDs lost, and no other major Britishlosses after this, the Enfield DD statistically should be the rarer gun.
So where are they all?
Converted to L4A3, South African 7.62mm or in use in some 3rd world country?