I'd give Brixton or Balfes my money if I was buying new. Or Compton in Catford.
Compton would be my choice, especially in SE London. They carry a good range of colours, and are happy to swap parts from other stock to get you what you want quickly.
^ This.
@andyp started
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I'd give Brixton or Balfes my money if I was buying new. Or Compton in Catford.