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The loss in Yorkshire equates to about 260 million litres every day.

Edinburgh and Birmingham airports have installed new scanners which allow bottles of up to two litres to be taken on board planes.

Yorkshire Water said it had supplied an additional 4.3 billion litres of water between April and June compared with a typical year due to the sustained hot weather - enough to supply Leeds for five weeks.

It will now be possible to take containers of up to two litres through security, and they will not need to be removed from bags.

The watchdog says that without dramatic action, England, which uses 14 billion litres of water a day, will have a daily shortage of more than six billion litres by 2055.