Had a quick lunchtime visit to the airfield again, to see if the shrike was still about. Despite no news and the disconsolate body-language of a few wandering birders who didn't appear to have seen her (I have decided, probably incorrectly, that she is a female!), I soon found the bird atop a Hawthorn by the entrance to the yard just south of Ebor Trucks. She again allowed close approach but sadly the light wasn't great for photography.
After scanning around in that Shrikey way they do, she flew into a young Ash where the light was better. She didn't seem too happy perching amid slender, swaying stems as this wasn't befitting a northern tyrant, so after a few moments she bounded across the road and off across the grassy field alighting atop a large bush, with commanding views. Much more suitable! I left the other birders to it and headed off to walk to dog.