It is hot enough that when I got in just now, after a 40-minute walk and then a 15-minute drive in a car whose air conditioning always takes a good 20 minutes to kick in properly, I thought I'd rather have a cold drink than a cup of tea.

At which point I discovered that my stock of cold drinks consisted of about an inch of rather old elderflower cordial and a similar quantity of similar vintage Rose's lime juice cordial. And, while elderflower and lime mixed is definitely refreshing, I should probably replenish my stock a bit.

So, DW. What are your favourite non-alcoholic summer drinks?