Welcome aboard, Evermind. If you're at Grimspound, definitely head backwards, and hopefully you'll like more of what you find. I'll echo Fritzinger's comments that you should listen to the "complete" Folklore tracklist, the vinyl version, which you can find on their Bandcamp page available for streaming and purchase. It's really the best way to listen to it, though with the updated/expanded version of "London Place" from The Second Brightest Star, it's a bit less complete. Either way, it's a great album overall, one of my faves.
After that, check out English Electric Full Power, which combines both parts of the separately released English Electric albums with songs from the Make Some Noise EP, mixing up the tracks a bit and creating a very well put together double album that feels cohesive, as if it was meant to be that way from the get go. Before Folklore, it was easily my go-to BBT album, and not just because I'm a sucker for double albums.
After all of THAT, hit up The Underfall Yard and Far Skies Deep Time, which is getting a re-release this year with ALL SIX tracks finally available on one disc - it was released with two different opening tracks; "Kingmaker", a re-recording of an old demo track, and "Master Of Time", a recording of an Anthony Phillips (of Genesis fame) demo track. Both albums are where modern BBT started their beautiful rise to musical perfection. The inclusion of David Longdon as a vocalist and writer really changed how the band put music together, and having Nick D'Virgilio on board full-time made some difference too.
But I am getting ahead of myself. Check those albums out and enjoy! Let us few BBT fans know what you think!
-Marc.