it's a legit question which is the pillar of (software) security thinking. It's called parallel or adversarial thinking https://en.wikipedia.org/wiki/Parallel_thinking

what would work in that case is take the Channel Tunnel to England, then lie about how long you've stayed in the UK. It probably wouldn't work if you have taken a flight out/in the EU in the past months as that would show up to any customs official.