Hybris Cherry & Vanilla imperial Berliner sour by Alpha Delta Brewing, 6.5% ABV, 1 litre growler bottle. As described by the brewery:
"Full of flavour, with a delicious tang. Well balanced sour that's perfect for the summer".
1 litre is only £10, then just chose between the swing top bottle (+£2) or the screw cap (+£1). Bring your bottle back to store for £1 off your next refill, making it only £9!