Oh my friend! I was the very same: TLBL was the only of their albums I had, and it was SO good that I worried about buying others, as I did not believe it was possible they would be as good.
How wrong I was!
The Spirit of Autumn Past
For all we shared
Passengers
Heart full of sky
Storms over still water
all fantastic albums, and I'm sure the new one is going to be just as good (haven't managed to get to listen to it yet).
And yes, I'm a progger --- into Marillion, Genesis, Pendragon (LOVE "Believe"!), Pallas, Arena, Fish, Edenbridge, Leaves' Eyes... so many good bands.
We must talk!