What am I bid for Eric Ennion pen-and-ink study of two Rosy-coloured Starlings strutting their stuff?

 

This intriguing pen-and-ink study of Rosy-coloured Starlings by Eric Ennion (1900-81) is tomorrow (October 9) due to go under the hammer at a saleroom in Gloucestershire. According to auction house Dominic Winter, the pre-sale estimate is that it will fetch between £100 and £150.