Eightbore - check plate #34 in the Purdey book. I think that's the same design. I believe it's an Adams-patent action. I've seen a handful of these.
The price that GM Auction got for their's was pretty high considering the overall condition of the gun. They had that gun at Vintagers and I checked it out. It looked OK - but not that OK.
Before Purdey went with the Beesley, they must have experimented with a handful of different hammerless actions. I've seen a couple of different ones, including the one noted above. I'll try and find some pics of them.
.400NE - I don't think I understand your comment. Rogers patented his action in 1881 or 1882. I don't think he had any affiliation with Webley. Did he?
I know Webley & Scott made some sidelocks called W & R (Webley & Rogers), but I thought this was well after the Scott - Webley merger. Did Webley make sidelocks on the Rogers action before the merger?
Before this Scott - Webley merger, and post 1880, I don't know if Purdey used any others actions on their sub-grade guns other than the A&D. I have some info on that Purdey that I posted earlier in this string and I'll have to look it up.
OWD