I had both a 28 and 12 bore back action sidelock marked Cogswell and Harrison...made by W&C Scott of Birmingham, apparently. On all 3 the barrels dropped and pulled rods forward to cock the locks.
Are you certain they were
made by Webley & Scott? Cooley and Newton's book describes C&H's back action sidelocks:
"...a mechanism that uses hooks on the barrel flats to draw forward cocking rods...William Middleditch Scott, son of William Scott, co-founder of Webley & Scott, was a Birmingham maker who built guns on this patent for London makers including Holland & Holland and the action was made under licence by Cogswell & Harrison."This suggests that the back action Coggie sidelocks were made by C&H in London, with a cocking system
licensed by Webley & Scott of Birmingham.