While I am waiting patiently, hoping a Typhoon frame and any rough Webley projects might turn up, I have been having a small tinker with stuff.
I recently bought a Webley Hurricane ---that was a little rough but mostly ok. After having a plink I decided to strip and lubricate it as it did seem a little dry.
The piston was her was a little tight so that was eased and the small spring in the cocking links was changed as it had broken.

What was quite interesting to me was that the "bump" on the trigger was wearing, along the lines of the "tuned trigger" that I put on Danny's site. I decided not to touch that yet as the trigger was not too bad.
When I plinked again, I then thought that the pull was too heavy and too long. I have tried softer springs in the past and have cut a few coils off some. I found one I had cut down a bit and fitted that then took up some adjustment with the adjusting screw in the trigger. This resulted in a very short pull and seemed to "speed" things up.

Now I may be wrong with this---and a lot of it is based on feel and I suppose some of it is subjective. I feel that a longer pull is more likely to make you pull your shot as the more your finger travels, the more movement you are likely to get in your arm. I have bad arms and have to shoot two handed as as soon as I start to take tension up in the trigger, my arm hurts and I have a tendency to pull a shot to the right.

A quick digression on a Milbro Cougar, adjusting the trigger screw reduces the engagement in the 2 sears, but increases the length of pull, which i why i came up with the wedge insert idea that is also up on Danny's site.
On a Scorpion i adjust the screw up so there is virtually no take up in the trigger.

But back to Webleys. I think with their firing cycle and short sight line, a longer pull is more likely to make you pull the gun down or right (if you are right handed) . Your own thoughts are appreciated, but for me, a very short single pull is the best.

I am still hoping one of the engineers will do a one piece trigger for a Senior , a bit like a Bsa Cadet one, so it travels through an arc and does not have to try and pull the sear vertically.