Spring Day

At last it seems that spring is here. Tonight our summer time begins, a cause of great confusion amongst many supposedly intelligent northern hemisphere acquaintances who like to phone antipodeans in the middle of the night. Yes, we are officially $12$ hours ahead of GMT ... BUT ... since we are now going into summer, there will be periods of time in spring when we are either $11$, $12$ or $13$ hours ahead of time in the UK, depending on whether or not we, or they, have summer or winter time. Please check the clock!