Might not be a true price glitch, looks like a just eat discount or something, but anyway a pretty solid deal

Persil Colour Laundry Washing Liquid Detergent offers outstanding stain removal whilst keeping colours bright With this liquid detergent, you can get tough on ...

With the £5 voucher and max S&S it works out at just over £1 a can, which is excellent value for a really nice IPA.