I think if there were an award for most typically British pony book title, Not Such a Bad Summer would win it. It really could mean anything, from 'it only rained for four weeks out of the six,' to ' we managed to spend all of it at our estate in Scotland with our own herd of Highlands, but don't want to appear boastful.'
In this case, if you'd asked the protagonists of the book what their summer had been like, and they'd replied "Not such a bad summer," what they'd actually have meant was that they'd hurled themselves about Dartmoor looking for an escaped prisoner, who repented (perhaps not totally convincingly), and then had to be rescued from worse criminals.
Pretty normal really.
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