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By ASHLEIGH MCCAULL Published: 17:42 EST, 4 January 2026 | Updated: 17:54 EST, 4 January 2026 <!-- --> <!-- --> <!-- --> <!-- Measuring…

The summer holidays are here and no trip to the seaside is complete without building an enormous sandcastle to the envy of other beachgoers. But as any holidaymaker will know, there's nothing more frustrating than being halfway through…