I'm amazed that an Enfield rifle has such a high value compared to the Bren. We must have imported them all into the USA because they are readily available here in live, functional condition
I've always had nice shooters of the various patterns but needed two Number 4 Mark I rifles to keep with the T-16 for display after I did the restoration. They used to cost $69-$79US in average condition but I broke down and paid $100 each for mine as I wanted to go up to the very good condition grade. Really weird how something produced in the UK in such a large quantity would become so expensive.
On your Bren, I've seen a lot of people over there with resin copies of the barrel to fill out their spare barrel case or locker when on a Universal Carrier. Used barrels can be found at shows over here for $25-35US but there isn't any way for you to get them into the country legally which is a shame.