Your occasional “Here’s an idea” series asks readers to contribute their own little gems of genius. So here’s mine.

I now spend much of my working day deleting offers to help with my erectile dysfunction, advise me on my stock investments, sell me Rolex watches, clear up confusion about my bank account details. So why not charge 1p a time for sending an email? Not only would this remove the curse of spam and increase the productivity of every office in the country, but the money raised could be spent on engineering projects to give potable water to everyone now without it. Come on Building readers, the campaign starts here!

David Franklin