Starbucks Caramel Frappaccino in hand, I parked myself on one of the well-worn couches in the Hampstead branch to escape the midday sun. Around me, tables were being used for impromptu business meetings, while old friends chatted over steaming espressos. I was smugly slurping the cream from the top of the cup when it dawned on me that the £3.20 cost of this thick, frozen, altogether harmless-looking beverage had single-handedly eaten up 10% of my weekly income.
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