No 116 LL (old packing factory on corner of Bassano St, next to Thomas More(?) hall) is supposedly being converted into consulting rooms for some Harley Street consultants - this was second hand info, but might be the gym/osteo place you are referring to. I had also heard that Bombay Bicycle CLub have pulled out, don't know whether it's true but could well be, given how long they have had to open up.