Here is what I can tell you about your Enfield No. 4 Mk. 1/2. It was made by the Royal Ordinance Factory (ROF) at Maltby, UK. It was later in 1952 FTRed (Factory Thorough Repaired) at the ROF Fazackerely. At that time it was converted from a MK. I to a Mk. 1/2. What that means is the receiver was altered to accept the trigger. Mk. Is have the trigger mounted to the trigger guard and Mk. IIs have it mounted to the receiver. Converted Mk. Is are called Mk. 1/2 and converted Mk. I* are called Mk. 1/3s.
Based on the butt stock and the FR mark, I would hazzard a guess that it saw service in other parts of the Empire after it was FTRd. The way to tell is to look for the out of service English proof marks. In England, when a rifle was sold from military stores to the private market, it had to by law be proofed out at one of the two proof houses. If it was, you would find the proof marks under at the muzzle end of the barrel, on the bottom. IF those marks are not there, then it was sold out of service from a different country, possible India or Pakistan.
Are there any import marks? Either the pre-1968 England mark or the later marks?
The cross bolt at the butt end of the fore end does not look standard. The screw looks too large and the bolt on the other end looks odd. Can you post a pic of the whole rifle and the markings on the underside of the muzzle end of the barrel?
A rusty bore just might clean up real nice. I bought a Carcano M91 2 weeks ago with what looked like a rusty bore and it cleaned up real nice.
Does the serial number on the flat back of the bolt handle match the receiver? If so, and if the bore cleans up I think it would have a retail value of $300-350. If the bolt does not match, I would say $250-300. I see prices on these vary greatly these days. My pricing is for local Maine. I think they go for more in MA.