The 2 photos which will be posted by Marrakai later this evening
(below this post) are described below.
Both are 500 x 3" Nitro Express DR's.

The LEFT gun is a (Joseph Lang) Webley Screw Grip
you can see the Spade shaped Dolls head that intersects
with the Toplever Spindle

The RIGHT gun is a (Army & Navy) PHV1 actions
you can see the Club (as in Ace of Clubs) shaped Dolls
head that DOES NOT intersect with the Toplever Spindle

You can see how "the dolls head cams the barrels down "
by the shape it. It almost "pulls" the barrels tighter as the
Toplever closes and hence why the Screw grip and PHV1 actions
generally do not come loose.

Quite a few other actions look very similar to a Webley PHV1
action but are not.

You can also generally tell a Webley from a distance by te shape of
the fences.

Also, you can just see on the Joseph Lang stock behind the action
an engraved piece of metal which - this is an insert covering a
cross bolt through the stock.
Some Webley's (and others) came with this, some didn't but
I have heard the unititiated say it is a repair - not necessarily so.

Hope this is clear.

500 Nitro