Thanks for the responses.
So it basically boils to down to my current living arrangements. I'm lodging in a house at the moment with a couple of others. I don't physically have enough space in my room for my bass amp so it stays at my parents' house 300 miles away. Seems a shame, its not being used and I just borrow a really crappy combo from a friend for gigs. I'm not gigging that much at the moment as I'm mainly playing guitar but I do play maybe twice a month - enough to justify a decent -ish small setup.
The thing is I freakin love the sound of the Eden through the UL310! Physiologically I see the Eden as a big amp but in reality that's just because its at a 4U rack with a tuner. Maybe a better option would be to get rid of the rack and tuner and pair it with a smaller cab? I'm guessing the UL1x12 sounds similar to the UL3x10?
Chris, you mentioned a barefaced compact. Just did a google search, they seem cool. Maybe its about finding a good 1x12 to go with the eden rather than swapping out completely. If I do get some bigger gigs then I could always add an additional 1x12 later down the line? The eden can run down to 2 ohms too.
Just putting thoughts out there has helped. Any other cab recommendations which have a small footprint that sound similar to the UL310? How much do UL310's go for, would be a shame to sell it though, but doubt I could justify the £££ for an additional cab.