I had to resort to the Channel Mixer to transform today’s subject. So what have we here? This is actually the top of a VOR beacon, a key ground navigational aid in the world of air traffic control. This particular one is situated on an abandoned airfield. Don’t ask me any technical questions on this, but if you end up arriving in London-Heathrow from the south-west and have to queue for a landing slot, you may well be undertaking a circuit centred on this beacon.