Deer, deer! Gordon takes his photographic opportunity

Does anything escape the magic eye of Gordon Ridgewell?
He shares with us: “I had a ride round the lanes at Littlebury Green and Strethall this morning and a few deer ran across the road, so I stopped and opened the car window.
“About 30 of them were gathered just in the field, so I was able to get this pic without getting out of the car.”
How does he do it?!