We found Amazon's secret drone testing site hidden in the English countryside

Amazon's delivery drones are being put through their paces at a secret location in the heart of the English countryside.

Daniel Buchmueller, the cofounder of Prime Air, Amazon's drone business, told journalists at a press event last month that Amazon's largest outdoor drone test site was somewhere in the UK. However, the company's PR team has repeatedly refused to give away any more information than that.

The Civil Aviation Authority (CAA), which regulates drone flying in the UK, has also refused to reveal where it has given Amazon permission to test its drones.

Several reports suggested the site was near Amazon's R&D centre in Cambridge, with the BBC reporting that the drones were being tested south east of the university city at a historic site known as Fleam Dyke and The Roman Road. But photos of the site have been scarce - until now.

Business Insider travelled to Cambridge to try and locate the drone test site. Here's how we got on:

Disclosure: Jeff Bezos is an investor in Business Insider through his personal investment company Bezos Expeditions.