It has a real warren of passages down below where the loading bay is. You may be able to lock it down there.They’ve been very helpful when I’ve worked there
Yeh I worked there about 20 years ago for a couple of years doing maintenance. If its still the same layout there’s nowhere to store a bike in reception really, only a very small left luggage room although that might be empty of luggage overnight.
There’s a huge basement with loads of rooms, one long passage with loads of rooms off it, but when I worked there there wasn’t any locks on any of the doors so wouldn’t be very secure. Wonder if the top two floors are still unused, I used to do emergency light checks up there and it creeped me out.