You can really get into the surplus collecting, if you want. Just for Lee-Enfield, there is the British, Canadian, and Australian makes. The Indian Army had the Ishapore armory. Then there was the US-made L/E under Lend-Lease. That's just one WWII nation.
You can build a pretty neat collection from just the US, UK and Empire, France, Germany, Italy, Russia, and Japan, but consider adding a good bolt-action from the smaller powers, such as Holland, Belgium, Yugoslavia, Czech, Poland, there's a bunch of them. Finland has some good battle history. Then there were the Neutrals, important to the war efforts on both sides, such as Switzerland, Sweden, and Turkey. Post-war rifles can be interesting, too. Lots of German K98s went to Israel in 1948, and Norway converted them to 30-06 for their Army after the war. The FN49 is the rifle that didn't get built during the war, but certainly would have helped the Allies, although I believe the war effort would have been aided better by dropping the Lee-Enfield in favor of the US MI rifle and carbine for the UK forces in 1942.
You can make your collection as big or as small as you like, it's all good fun and I've never met anyone who doesn't show some interest when they see a good surplus rifle, even folks who don't 'like guns' have a benign attitude towards them.
The Russian rifles are so cheap right now, you can get a dozen of them in a year and not feel it....
Don't forget to shoot them, now and then.