Many thanks for all replies, most useful. Greens on the way.

Also thanks for the suggestions of other scanners to look at, time willing I'll try them but our time scale to access this extra cash is really tight. The boss likes the reputation of Retina so that probably means unless we find it to be trash we'll probably get it.
It's a rush job, not ideal but I'm sure many of you have been in the same situation.

'll probably add to this thread as I'm using it or pm those of you who've offered.