Nice photo but a cropped section of DND Archives PL-44557 Caption MAY 31 - 1945 Lancaster Bombers of 428 "GHOST" Squadron and 428 "MOOSE" Squadron Taxi on the Flight Line in Yorkshire England -
Looking at the Lancasters the lead aircraft is possibly a Canadian built machine note the lack of a pronounced collar around the mid-upper turret with twin .5 cal as opposed to the second machine with the .303 cal also note the difference in the roundels on the upper wings, little in the way of standardization -
I'm not sure there was a 6x6 Matador refueling vehicle but there was an AEC 854 & 0854 6x6 2,500-gal Petrol Tanker I believe Matador refers to the AEC "Matador" Tractor 4x4 Field Artillery or so a little publication from 1944 to do with Bridge Classification of Vehicles Army and RAF list