[maxwell smart]

There's actually at least 3 different sights for the No5, the ones on the left & right are both Mk1 sights but have a different size "battle sight"

The Mark 1's look to have different adjusting screws, so the change per click might not be the same.

 

[maxwell smart]

Given that the L-E is a cock-on-closing action, there should be no need to have to de-cock them - if you hold the trigger fully rearward as you close the bolt, the sear does not catch the cocking piece, and so the rifle never gets cocked in the first place. This is quite different to dry firing after closing and cocking the bolt.