I arrived at Mrs Y's ready for whatever her shopping list called for, but discovered that all she needed was eight bottles of red top Evian water (I'll admit I didn't realise that Evian came with different bottle top colours...). After some discussion between her and her husband (largely in Italian) about whether I'd be able to carry this much water and the best place to find it, I set off towards Tottenham Court Road confident that one of the supermarkets along there would be an oasis.

So it proved, first stop Sainsbury's came up trumps and eight correctly coloured lidded bottles later I was walking back to Mrs Y's flat to drop off her liquid refreshment - they were very grateful for my efforts. I headed back downstairs into the afternoon heat to find myself a bottle of something cold and refreshing - lid colour less critical.