Nice find Warren ...
For those newer collectors who may wonder what it is, check the MKLunder this entry in the United Kingdom
section......
1917 No.1 MkIII* Rifle (137 picture virtual tour ... click here)
(Click PIC to Enlarge)
The rifle shown in the virtual tour is correctly serial number matched and in addition, is equipped with a very rare Flanders Flap. This flap was designed to keep the mud out of the barrel, but was spring mounted so it could easily be opened, or flip out of the way if the soldier accidentally discharged his rifle without opening it.
(Click PIC to Enlarge)
(Click PIC to Enlarge)
(Click PIC to Enlarge)
(Click PIC to Enlarge)
Regards,
Doug