I have been down the pub, but please bear with me and excuse any linguistic infelicities (had to type that twice).
1. Brixton already has (banks not included) M&S, WH Smith, Subway, Body Shop, Argos, Boots, Tesco, Sainsbury, Superdrug, Currys, Halfords, McDonalds, Woolworths KFC.
As far as I can tell, the present bunch of chain stores has done little to improve the quality of life for Brixton residents, and very little to improve the local environment, by which I mean building improvements, litter control or in any way making an effort to seem like they belong here. In my book, the only ones that have any real credit here are Woolies and M&S, which have stuck in Brixton through thick and thin (although it has to be said, with minimal investment in their premises). RIP Lloyds Bank (the real one, not the plastic branch on Acre Lane), British Home Stores, Bon Marche and even Pizza Hut.
2. Before I moved here, I lived in Archway, not far from Islington Green. At the time, in 1988, Islington had junk shops, greengrocers, newsagents, butchers, an interesting market. It was a great place to live. And then, it "tipped", as you might say. I go there now, and I see tapas bars, Starbucks, Costa coffees, Thai restaurants, a flourishing economy with no soul whatsoever. In 1988, just about the only place to eat in Islington was Pizza Express. While I recognise that, for some people, the current state of affairs is a consummation devoutly to be wished, I would really hate for Brixton to go the same way, especially at a time when the circle has turned and "real" shops are making a comeback. Lambeth and Islington councils both deserve the contempt of the people who vote and pay for them, for their failure to find the right balance.
3. That said, I would like a Pizza Express in Brixton. Take over the old cinema on the Hill. Go on.
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4. And if you want to turn the Railway Hotel into a Starbucks, for God's sake refurbish the building thoroughly and properly and get the clock working.
5. While I'm rambling, one more thing. In 1990 or so, I was working on a well known London listings magazine, and we decided that, it being summer, we'd do an issue for tourists: the London their guidebooks didn't tell 'em about or somesuch stuff. Our tourists, selected at random from lost-looking people wandering around Oxford Street and then offered a day out on us, were taken to Brixton Market as part of the deal. ALL of their guidebooks had told them it was a no-go area. All of our tourists were crapping themselves. At the end of the day, when they filled out their questionnaires, Brixton Market was the place they all wanted to return to and tell their friends about. It topped the poll by miles. Would that be the case if we'd sat them down on a Starbucks sofa?