Right, you definitely need to get in touch with them.
The shop IS still open, but with big 'SALE' stickers in the window, and perhaps more tellingly, a big 'Lease for Sale' sign over the door. So they're moving out - could be they're just moving, could be they've gone under.
I can't find their corporate details on the website (which you're supposed to show) but an AKTIVE8 Limited, incorporated in Scotland, was dissolved according to Companies House records on 25th January (although in that case it shouldn't still be trading).
I can have a wander up at lunchtime tomorrow for a nose about and ask if they're closing down....