My WW2 spy thriller Break in Communication is set around Porthcurno Telegraph Station. In the book the escape tunnel that the German commandoes tried to access really does exist and you can climb the steps to a lookout point with beautiful views of the Porthcurno valley. The lookout is where I imagined the sandbagged gun emplacement that was attacked at the start of the action.
If you're on holiday in West Cornwall this summer a trip to the Porthcurno Telegraph Museum is a must. The kids will love it, and you can buy a copy of Break in Communication in the shop as well!
I have a second WW2 spy thriller in progress and I'll be writing updates on how it's coming together with a few snippets of the action.