G-INFO shows that the owners 1960-1964 were B.K.S. Air Surveys Ltd registered with a Leatherhead, Surrey address. In the picture it is in full airline scheme and what appear to be full airline titles, as B.K.S. Air Transport. Before G-APHV which is a post war Avro C.19, in the mid '50 B.K.S. had a small fleet of several ex-RAF Anson 1s, with one converted to a Mk.11 and another to a Mk.12. B.K.S. were certainly in the survey business in the early '60s but I think G-APHV was also employed at times to haul spare crews and management around the country on company business. It never visited Liverpool while with B.K.S. Ltd.
When I moved to Atlantic Air Park in France, 2004, I met a neighbour who joined BKS as an apprentice engineer about 1960. He told me at the the time he was not that interested in aeroplanes; it was just a job he drifted into after leaving school. He had great mentors and went on to a full career in aviation, mostly overseas. Nevertheless he still remembered all of those Ansons by registration, and the quirks they each had, including ones he maintained for non BKS owners. He also told me about a time he was flown up to Speke to do work on a broken B-170. After working on it for hours he was so tired he fell asleep on it.
I used to spot at Yeadon from the late 1970s, when visiting relatives in Horsforth. I remember an upstairs office still had a nameplate for BKS (Barnby, Keegan, Stevens as was). Did they use a Rockwell Commander (green/white) around that time - still doing surveys?