Thanks folks.
Not entirely happy with the size limitations imposed by a Squarespace website, I have now created a separate link to a full sized version of the image on my previous site, here:
http://martinpughastrophotography.id...uartetFull.jpg
Greg, as it says on the page, the triplet of galaxies were taken with the RCOS, while the wider field to include NGC 7552 was taken with the RH.
cheers
Martin