https://www.theguardian.com/travel/2014/jan/08/pay-per-minut...
London: https://london.ziferblat.net/
Manchester: https://www.ziferblat.co.uk/
8p/min = £4.80 per hour. Bearing in mind I'd pay £5 for coffee and a cake in many places that seems reasonable.
UK: many public access spaces have places to sit and public wifi (e.g. central reference library, University buildings, some City Council buildings &c)