LIDL in Spain have customer toilets: LIDL in the UK do not!
There are very few public toilets in Spain; shops and bars are expected to provide free use of their WCs to anyone.
I used to buy something if I needed the loo, but it's not obligatory.
In Southern Spain, at least, every bar and caff is obliged to provide free (drinking) tap water to anyone off the street who requests some. (Dehydration in 40C is dangerous!)
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