Claridge's is one of London's most prestigious hotels. It has thoroughly researched the water market and found that plain old water has become like wine. Everybody has a favourite, and an opinion.

Many of the waters its offers are from Britain. Some of these are Belu, which is filtered through layers of ancient rock in the remote hills of Shropshire and Elsenham Artesian Spring Water that's decades old and bottled at source in a deep chalk confined aquifer in Hertfordshire.

Llanllyr, a very soft water, comes from sources deep below certified organic fields in West Wales.

From Europe, alongside Evian, Perrier, Badoit, San Pellegrino, Panna, Voss and Volvic, Claridge's introduces Wattwiller - a French spring water discovered by the Romans, its source still surrounded by a large swathe of protected woodland.

The list goes on from British Columbia's Thousand BC glacier water, New Zealand's 420 Volcanic water to Just Born Spring Drops from the Nilgris Mountains in India.

There is of course one more choice to add - a glass or a jug of old-fashioned London tap water which of course any guest is welcome to, at any time, free of charge.