Once again, for the whole of May, Shake Shack is teaming up with Auction Against Hunger which will get you money off shakes if you donate to the VERY worthy cause.
Just donate £2 to the charity when you next visit Shake Shack and you'll get a voucher for a free shake (worth £5.25) on your next visit. It's a perfect win-win if we've ever seen one.
The Great British Shake Sale will be at all Shake Shacks (Covent Garden, Westfield, New Oxford St) from 1 -31 May. For more, follow them on Twitter