This 15th July we're celebrating St Swithin's Day by spreading a little love on a very big scale. We're giving you the opportunity to tell someone how you feel on a national scale. Log on to Twitter and share your message with @onedaytwopeople. On August 15th we'll select our favourites and print them in the national Metro and run them on Times Online.

ONE DAY is the incredibly moving new novel from David Nicholls.

15th July 1988. Emma and Dexter meet for the first time on the night of their graduation. Tomorrow they must go their separate ways.

So where will they be on this one day next year?

And the year after that? And every year that follows?

Twenty years, two people, ONE DAY.