Reading the Guardian article, all I could find was this quote from the epidemiologist chap:
“There were no outbreaks linked to public beaches. There’s never been a Covid-19 outbreak linked to a beach, ever, anywhere in the world, to the best of my knowledge.”
You’re right though, I’d have expected local case rates among those in hospitality etc serving the beachgoers to rise, and they didn’t, which is great.
But if people who go to the beach return to hundreds of different towns after the day, get ill a week later, no-where is going to suddenly shoot up in terms of rates, and it is always going to be tough to point the finger at the beach trip as a source.
Realistically, the risk of an outbreak has to be minimal compared with an indoor venue – you might infect another person on the beach towel next door over the course of few hours, but the chance of delivering sufficient viral dose to multiple people has to be extremely low. The main risk has to be shared facilities, not the beach itself, and in preparation for a summer where beaches have to be open for the public, we should be investing in ways to boost cleanliness – more toilets, more cleaning teams.