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McDonald's (UK) has a hamburger for £1.19, or even a bacon double cheeseburger for £2.89. A happy meal is £3.89. You could reasonably feed the whole family for £20.
Five Guys (UK) charge £9.95 for their cheapest burger, and £12.25 for the bacon one. It's £4.35 for the cheapest fries and £4.45 for a soda. £20 covers one person's meal.