London’s five billion pound Super Sewer is now fully connected and promises a cleaner, healthier River Thames. The 150-year-old sewer network has struggled to cope with the twin challenges of an increase in the population it serves in the capital (from four million people when it was built to over nine million today) together with climate change. With rainfall overwhelming the system, it sometimes discharges into the Thames. With the Super Sewer fully connected, 95% of those spills are stopped.

I’m standing in the bathroom on the upper floor – you really don’t have to know what I’m doing –looking wistfully through the chartreuse-coloured cascade that is the weeping willow at the bottom of our garden and across the canal to Victoria Park. It is `just spring when the world is puddle-wonderful’ as American poet E.E. Cummings once put it, and we can no longer enter it. Like pints after work and an evening at the theatre, our beloved park is just a memory. It’s encaged by tall iron gates.