The charity shops here are actually a wealth of wonderful kitchengoods. I have picked up amazing things like a very sturdy preserving pan for £2, a vintage cocktail shaker for £2, champagne buckets (I think they were nicked from a restaurant, tbh) for a pound, etc.
I've also had good luck on Amazon for pots and pans, particularly Chasseur brand. I got a great cast iron skillet for £19.
The rest is a mix of John Lewis, Lakeland, some pound shop scores, IKEA and gifts from Williams-Sonoma.