Shopping in London and Florence

We're meeting up with my sister in London for a couple days before the group of us (7 adults and 2 toddlers ) head to Rome/Florence for a week. I really only have a day and a half in London, the same in Rome, and then a full week in Florence. This is my fourth time traveling to London and my second in Italy, but I never had a chance to check out any music stores. Are there any cool shops I should really check out in any of these cities for gear? If it makes a difference, we're staying in Thorpe county Surrey and Strada in Chianti. I'm not sure Mrs. Duder will let me buy anything, but I'd love to have a look around .

 

Anyone? Bueller?

 

Thanks!

 

Thanks, we can't wait to be back there!

 

I'm hoping to see something off the wall that we don't have here. An old effect pedal or maybe a discontinued bass/guitar.