Try posting some photos of your "jungle carbine" in the Curio and Relic section of this forum. There are some very knowledgeable folks here that could give you an opinion on the value of your rifle.
I collect WW2 rifles, so if I had a genuine No. 5 in good condition, I'd keep it. But that is me, and it is up to you to do what you want.
The Enfields are fun guns to shoot. Buy some ammo and give it a shoot. "try it you may like it!".
Go to this website to get some info on your rifle and how to disassemble and clean it (you should clean it well before you shoot it).
Collecting and Shooting the Enfield No. 5 Mk 1 Carbine - HISTORY