Mishman 732, your rifle looks original enough, and seems to be the real thing.
It seems to have been refurbished or possibly un-issued.
My own No.5 Mk.1 saw a lot of abuse with some repairs on the butt and some pitting on the flash hider and the action. The serial number (a low serial) is on all parts accept on the magazine.
The rifle possibly saw service during the Malayan insurection.