Curse words are illegal where you live? That has to be.... different....
http://www.cps.gov.uk/legal/p_to_r/public_order_offences/#Section_5

UK Law.
And the Police Constabulary vary from area to area (43 Constabularies in England and Wales) to how strictly they enforce it.
Also, some "common sense" policing goes on;
So outside a place that serves alcohol at 2am, some words are to be expected.
Outside a nursery / infant school at 8:30am with the same words and you're in deep trouble.
(Edit: Also, "Breech of the Peace" has been used to quell the odd potty mouth so families could enjoy a public space without having to put up with bad language)
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