Planning and Infrastructure Bill

Debate between Baroness Bennett of Manor Castle and Lord Cromwell

Committee stage
Tuesday 9th September 2025 Lords Chamber

[Baroness Bennett of Manor Castle (GP)]

My Lords, it is a great pleasure to follow the noble Baronesses, Lady Hodgson and Lady Parminter, and to offer support for Amendment 115, to which I attach my name, and for the general intention of Amendments 116 and 117. In the interests of time, I will restrict myself to Amendment 115.

I do not often take your Lordships’ House back to my Australian origins, but as this amendment has come up, I really have to. I am going back about 35 years to a place called Quirindi in north-west New South Wales. Somewhere out on the internet there is a photo of me sitting on a horse in a field, or paddock as we would say, that is dead flat and dead dry, without a blade of grass on it—that is Quirindi.

As an agricultural science student, I remember the farmer explaining how to live there. He took me out the back to the water tank, which was a very large tank that caught the water off the farmhouse roof. There was no town water in Australian farming, so that entire operation and household depended on the water that they caught off the roof. I still remember the farmer rapping on the side of the tin tank and saying, “That’s where the water is; we’re in trouble”.

Noble Lords might think, “Oh, that’s Australia—that’s far away; that’s a very distant place”. Quirindi has an annual average rainfall of 684 millimetres a year. There are parts of south-east England that have an annual rainfall of 700 millimetres a year, which is essentially the same amount. There is also the impact of the climate emergency and the fact that we are seeing more weather extremes and more drying out.

There is something Britain can learn from the Australian practices that have been enforced over history and that can be imported here for a win-win benefit. No one loses from the proposal in Amendment 115. As I think has already been mentioned, we in the UK use about 150 litres of water a day per capita. That compares with France, which uses 128; Germany, which uses 122; and Spain, which uses 120. This is expensively treated drinking water that we are using for all kinds of practices that we do not need to use drinking water for.

I am going to quote Mark Lloyd, the chief executive of the Rivers Trust:

“We also need to finally implement the use of rainwater rather than drinking water where we can, such as car washing, gardening, washing pets, filling paddling pools, and flushing the loo. Other water-stressed countries have used this approach for decades and we need to join that party.”


I really stress the “party” element. I do not think we have mentioned the issue of flooding yet. Many of us have been speaking about the need for land management to slow the flow. What could be a better way to slow the flow than to catch that water so that it is not flooding out into our drains, water treatment plants, rivers and seas and so that we can have it available for use?

Often, when we talk about water use, there is a lot of finger-waving: “People should switch the tap off when they’re brushing their teeth and people should have shorter showers”. But what we really need is a system change that makes doing the right thing the easiest, cheapest, simplest and most natural thing to do. That is exactly what this proposal is putting forward. So this is a win-win all round: for householders, cutting their bills; for preventing flooding; for protecting the environment; and for saving energy—we do not think about this much, but moving water around and treating water uses a great deal of energy. I looked up the stats, and we do not seem to have any good stats in the UK, but globally, the United Nations says that 8% of energy use goes towards treating and moving water. That is such a waste when you have water falling on your roof that you can use right there in place. Pumping it out to a reservoir, treating it and pumping it back in—all that uses energy. This is a common-sense measure; why on earth not?

[Lord Cromwell (CB)]

My Lords, I assure the noble Baroness, Lady Bennett, that many good things come from Australia, and she is one of them. The tapping on the tank she describes is exactly what I have been doing in Leicestershire in recent weeks. I have some experience of water harvesting, both from domestic roofs and from commercial buildings, and actually it is not very difficult, because roofs are all designed to channel water into pipes, and it is simply a matter of intercepting that water and using it.

I do have a couple of practical concerns. The first is that, as anybody who has done this will know, even a modest rain shower will give you an awful lot of water. As a result, any housing development or business premises is going to find itself with a very large need for water storage somewhere on that site, either underground or above ground. My second concern is how that water is recycled. I am not squeamish about drinking or using non-mains water. I raised a family on water drawn from an underground stream, not on the mains at all. But water left standing in a tank will grow bad and grow algae very quickly. If that is the solution, we need to find out how to treat it.

Furthermore, there is a real issue that I run into: the water companies and Ofwat will not even contemplate the danger of mingling water collected by a third party with mains water—in a header tank, in your pipes or anywhere else—because they are liable for the quality of that water. So, if you mingle it with rainwater, they will not allow you to draw mains water. The golden thread here is to find a system where rainwater is the norm and the mains is the back-up, but we are a long way from that at the moment and will be until the regulatory and practical storage issues are solved. To be clear, I thoroughly support this amendment—the spirit of it—but the practicalities of it need to be worked out effectively into the design of water systems supplying domestic and commercial premises.

--- Later in debate ---

[Baroness Bennett of Manor Castle (GP)]

I ask the noble Earl, and indeed the noble Lord, Lord Cromwell, perhaps rhetorically, whether they are aware of the One Million Cisterns project in Brazil, which aimed to deliver what it said on the tin and indeed has done so and was expanded subsequently. This is in the semi-arid area of Brazil, home to 18 million people. Brazil, of course, has a lot less infrastructure and is much economically poorer than the UK, yet it has been able to deliver a programme that has won United Nations awards and had all sorts of impacts. I hope the noble Lords will acknowledge that since other countries have achieved this, maybe it is not an unreasonable expectation for us to achieve it too.

[Lord Cromwell (CB)]

I should just quickly say that we can learn a lot from Brazil as well as Australia. I am in favour of the amendment; I would just add that I did not realise that water butts were a declarable interest, and if they are, I had better declare that I too have some.