I needed an emergency front light the other day when at work in central London - went to the last bike shop in the West End, Evans on Mortimer Street, to find that it's closing down in May and is running down its stock, so in a couple of months there will be no bike shops at all in the West End, presumably because, like me, all the bike commuters are now working from home a lot of the time!
Interestingly, when Evans goes, if you're in Soho or Fitzrovia, the only local place to get bike bits will be Sports Direct on Oxford Street... in a small corner of a dark little room up on the second floor (Evans didn't have any cheap lights left).
A few years ago, there were several Evanses, Soho Bikes, Tokyo Bikes, Cycle Republic, Cycle Surgery, probably forgetting one... Bikefix remains but is a shadow of its former self and is just a little workshop. There are still specialist bike shops in central London, just around the periphery...