There was a series of standard tankers built to this design as has already been pointed out. There were 7 steamers and 13 motor vessels. Everards had none of the steamers. At various times they owned the following motor vessels:
This is the Austility as far as I can tell. At the after end, bottom of the midships accommodation and its black paint there is a wee white square. Quite prominent in this picture. In Everard of Greenhithe by K.S.Garrett is another photo of Austility and the white square is also prominent .... none of the other in this class are painted so. In fact they all have slightly different schemes and that wee white square on Austility stands out as a distinguishing mark. She also has a single white mast whereas Amity has two buff ones. Anonity has a squat funnel and single buff funnel. Acuity has two white masts and a squat funnel.