
There's no getting away from the fact that, so far, it has been a dismal summer. And there's one activity that the poor weather is guaranteed to mess with which is the great British picnic. Luckily for us, the supermarket giant Sainsbury's has come up with a wheeze that for one weekend at least means Londoners will be able to picnic without worrying about rain stopping the fun.
They're putting up a
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