Mandraki Beach Resort: Hydra’s hard-to-leave hideaway

Do you know what the fastest-moving creature on Earth is? Forget peregrine falcons, cheetahs, and Usain Bolt, it’s two British people, deprived of heat all summer, arriving by boat into a secluded, sun-dappled Greek cove, and changing into their swimsuits. 0–100mph in 0.2 seconds flat, Mrs Smith is almost naked, champagne in hand, and I’m…