Doesn't the UK have sprinklers in front of major places like Parliament Square, Royal Naval College or even in Golf Courses. Here in the US, we are building new golf courses in the desert (Utah, Nevada) and use either ground water or the Colorado river even though their level has been falling.
The UK gets enough rain that grass generally grows on its own - so you only need a sprinkler system during periods of drought. And periods of drought generally come with hosepipe bans, which means you can't run the sprinkler anyway.
Most venues choose to show 'leadership' and 'solidarity' by following any hosepipe bans, rather than trying to get an exception.
Sprinklers are used occasionally though - for example, establishing newly seeded grass. Golf courses might use them on the putting greens, but rarely on the fairways.
The third picture of the set shows the greens but not fairways.
> A view of the greens and fairways on a golf course near New Romney in Kent on 5 August, as parched parts of England face a hosepipe ban ahead of another predicted heatwave. Months of little rainfall, combined with record-breaking temperatures in July, have left rivers at exceptionally low levels, depleted reservoirs and dried out soil
https://www.youtube.com/watch?v=rWpui1P9cAY
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