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It is tap water.
For spring/mineral water, it will be from a groundwater source typically private
Radnor Hills Is a company that came to mind
https://www.radnorhills.co.uk/about/our-story/
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Thanks @musa
Definitive! Maybe not, it may well actually be that its a 50/50 call as there doesn't seem to be either a hive mind consensus not a government or national one.
Without wanting to sound all conspiracy nut nut, I wonder if Thames Water, considering recent events, can be relied upon to publish the correct data.
Thanks for clearing that up Musa.
But I am still non the wiser.
So if I don't have a filter under the sink, it tap water (from south west London) or bottled spring water clearing?