Marstons Old Empire, 5.7%, currently £1.25 at Sainsbos. A good abv (alcohol-by-value) if you like the beer.
They also have Wild River and Bengal Lancer at 3 for £5, I think a couple from these pages have those on previous shopping lists?
And if the missus likes fizz, Antoine de Clevecy champagne is £9.75, if you take up the 25% discount on > 6 botlles of wine (I think mixed btls qualify).
I'll be ordering a few 6s of Viognier and Shiraz...