I really wouldn't. Worth noting, though, that there are serious issues with water penetration in the Victorian brick vaults that means the unit in question (and others) may not be opening for some time. Just a walk through the arcade will show the sheer amount of plastic sheeting and guttering that has been installed to intercept the ingress. I think Network Rail are pretty clueless as to how to stop it whilst maintaining the vision of seeing the original brickwork.
The stretch from the lift to the exit gates is particularly disgusting, as it is lined with buckets and the stained 'pillows' they are using to absorb the leaks. Laudable to maintain a view of the original brickwork, some of which is amazing, but how many people appreciate it? It may be best to cover it with corrugated sheeting to direct the water towards drains - if possible?