Where i can find a thrift shop/second hand market near the centre of London? I would like to buy some used and broken electronics?

Where i can find a thrift shop/second hand market near the centre of London?
I’m from Italy and i’m leaving saturday, i love repairing consoles/tablets/electronics as i’m a technician, i would love to buy something used from London as souvenir and repair it when i’m back home.
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