Is it my imagination or does Pimm’s get weaker every year?

Call me a terrible lightweight, but I’m a little wary of drinking cocktails when the sun is out. A summer drink should be like a good soak in the pool, but the sort of cocktails I love — martinis, manhattans etc — are all about a sharp injection of alcohol into the system, a sharp injection which can quickly turn to drowsiness or even irritability on a hot day.