What an amazingcoincidence!!!! I have just been perusing some old Air Pictorials before coming upstairs to put them on eBay and, not an hour ago, I was reading about G-AWMG photographed at Bovingdon before flying to Biafra where it crashed 3/9/68. It belonged to Mercy Mission, as presumably, did G-AWML.
The Air Pictorial was the March 1969 issue,
The US registered Anson was G-AWSB originally.