they have a nice english bar percussed lock L&R 500 S, and a good selection of matching hook breech systems up to 1 1/4 " that work together
That's a false assumption. They do not work together. The L&R bar lock is a shotgun lock, to be mounted at the bottom of a round barrel, as are the Pedersoli locks. Any other application will result in the mainspring not clearing the barrel.
The L&R can be used in conjunction with a Davis drip bar for a one inch Oct/round barrel. Because of where the mainspring is hung, any other application will result in barrel clearance problems.
Any application larger than 1" should use the Davis Alex Henry lock and drip bar as it is properly sized for larger breeches. The exposed reveal of the lock panel is determined by the lock/breechplug combo used, as is the shaping of the stock between the edge of the reveal and the tang. There are other hardware issues also, as you cannot just order trigger plates, guards, and triggers and expect them to fit, as they are not matched to one another.
Pecatonica's Rigby components all fit together. Track's English sporting rifle's components all fit together. Don Brown's Alex Henry components all fit together, but are no longer available as he is deceased. Anything else is a $#@* shoot. No one else is offering English component sets, and if they are please let me know too. In addition,you will note that most of TOTW's parts are not in stock and require long waits.