Laurence, by a strange co-incidence, while looking for something else, I found an airfix kit of a Wellington in my attic. Accompanying the box was a publication entitled, "Wellington in Action" (Aircraft no.76) produced by Squadron/signal publications, inc. (price $5.99).
These publications are designed specifically for the aircraft modeller and include various marks, mods and colour schemes with lots of photos. (There are some jolly odd shaped Wellingtons among them !) While browsing through the pictures I came across the ones of "Sister Anna".
All very interesting !