Yes. It didn't start out as a SeaLife centre (an unusual situation, as it's much more common in the UK to find aquariums that used to be SeaLife but no longer are). It has a location most attractions would commit rather heinous crimes for, in the lower levels of the City Hall building, just next to the southern end of Westminster Bridge and between the Houses of Parliament/Westminster Abbey and the London Eye - and it gets very busy on weekends. This visit was opening time on a weekday and it was deliciously empty. It's actually looking rather good these days, I thought (certainly by SeaLife standards), though I'm not sure this photo is the best example of that!
Maguari, do you have a list at all of aquariums that used to be SeaLife run and aren't now? I know of Portsmouth but don't know any others, would love to know!