week. My job is to help locate them and replace the damaged pipes. Why did you come and find us?’
‘I wanted to ask you about—’ He had been about to say ‘Elliot Copeland’, but something made him change—‘Mrs Singh. I know the matter is concluded, as far as the authorities are concerned, but I wondered if you had any personal thoughts.’
‘It’s funny you should ask. I’d been thinking of what your partner said at our party, about her drowning in her own house. It struck a distant chord, I just couldn’t put my finger on it at the time.’
‘Oh? In what way?’
‘It sounds silly, but—darling, I think Brewer’s tired, could you take him home? I’d like to take Mr May to my office and show him something.’
The innocuous steel building on Canal Walk did not look like the headquarters of a water board. Apart from a guard reading the Sun in the reception area, the place was empty. ‘Oh no, it’s not here,’ laughed Oliver. ‘This is a temporary on-site venue, somewhere we can plug in our laptops and hold meetings. It’s a fascinating business. I can give you a potted history, although I don’t see how it will help.’
‘I don’t mind,’ said May casually. ‘I’ve a little time to kill.’
Oliver led the way to a bare office of maroon carpet tiles and plan chests. ‘Well, it goes back to a chap called Hugh Myddleton who created the New River, which we think was the world’s first Build-Own-Operate project, a channel carrying water from springs in Hertfordshire to Islington. It became operational at the start of the seventeenth century; it’s still partly in use today.’ He pushed over a chair. ‘Make yourself comfortable.’
May seated himself. ‘So a London water board has been around since then?’
‘We were needed from the outset. The huge influx of people from rural areas increased pressure on the water supply, but we had the steam engine and cast-iron piping to improve things. Of course, there was a terrible rise in waste. Indoor plumbing was nonexistent. Chap called Harington invented the first indoor toilet in the 1590s, but it wasn’t widely adopted because there was no supply of running water to flush it. Cesspits were an advance, but they weren’t emptied very often. Now, I know it’s here somewhere.’ He pulled out a drawer and began leafing through the plans. ‘The Thames was the main source of drinking water for London, and remained pretty clean until around 1800, even supporting a decent fishing industry. You could catch lobsters and salmon in its reaches. Unfortunately, it didn’t last because not enough cesspits had been built. Residents started illegally connecting their overflows to surface drains and underground rivers flowing into the Thames. The rising tide of sewage destroyed all life in the water and it began to smell, especially in hot weather. I’m sure you’ll have heard of the Great Stink of June 1858, when the stench became so lethal that no one could work inside Parliament. The cholera epidemic killed two thousand Londoners a week until Dr John Snow discovered it was spread in water, and closed the infected pump in Golden Square. The John Snow pub in Broadwick Street is dedicated to him.’
‘Didn’t Bazalgette come up with a plan to build sewers?’
‘Yes; a pity so many people had to die before Disraeli could be convinced to implement the system. It’s an incredible piece of engineering, a series of cascades that race around the city washing everything away. After that came chlorination during the First World War, then double filtration and new steel water mains.’
‘What about these days? I mean, where does all the waste go?’
‘North London’s waste goes to Abbey Mills Pumping Station in Stratford, and an outfall sewer takes it to the treatment plant at Beckton. South London’s goes to Deptford, and from there to works at Plumstead.’
‘And what happened to the underground rivers?’
‘Some were turned into sewage outlets, but most were difficult to drain after centuries of abuse. If you block up a river, the water still collects and has to run off somewhere. Houses are getting wetter again. The water table is rising due to climate changes, and the old rivers are on the move once more. But using them became redundant in 1994, when we opened the capital’s underground ring-road, which allows water to circle the streets of London. It’s one of the secret wonders of the world.’
‘Is it big enough to climb inside?’
‘Well, it has a diameter of two and a half