Sounds interesting VBB, any chance of posting a photo of the painting on TMA?
Sorry I cant help with your question but maybe an enquiry to the British Library or Tate Britain would throw up some answers. Coincidentally, BBC1 are beginning a new series on Sunday, 5 June at 9pm entitled <b>A Picture of Britain</b> in which, "David Dimbleby reveals how the British countryside has inspired artists and writers." One of the paintings he will be looking at is <b>Stonehenge</b> by John Constable. Running in parallel with the series is <b>A Digital Picture of Britain</b> on BBC4 where viewers can learn more about digital photography and submit their digital images - the best ones being displayed in the Museum of Photography in Bradford.*
Given the standard of photographs on TMA I would think a lot of them stand a good chance of being up there with the best :-)
* More info at http://www.bbc.co.uk/arts/apictureofbritain/