As summers of extreme heat become more common, the UK must protect its workers | John Harris

There's been fury in Spain over the tragic death of a street cleaner. It's not hard to imagine something similar playing out in the UK

Montse Aguilar was only 51 when she died. She lived in the El Poble-sec area of Barcelona - it translates from Catalan as the dry village" - where she cared for her 85-year-old mother and sang in a local choir. For three years, she had worked as a city street cleaner for an outsourcing company, wearing a lime-green uniform - made, her family later said, from 100% polyester ... a material used to make coats".

On 28 June, her shift in the city's Gothic Quarter began at 2.30pm and ended seven hours later. The temperature that day had reached more than 35C, which left workers like her exposed: Spain has a clearer system of regulations covering heat and work than a lot of other countries, but it is still full of gaps.

John Harris is a Guardian columnist