Mr Hetherington added: "We are looking at opportunities right in the heart of London. We may not go right into the middle of the city straight away, but I've been looking at sites in the London Bridge area." Aldi now claims that half its shoppers are from the wealthier ABC1 social groups and its biggest selling frozen line is the gastropub staple, lamb shank. Mr Hetherington said: "We've had shoppers from Waitrose and even Marks & Spencer come to us.