That second 'extractor' on the UKNo7 isn't really an extractor as such, even though someone in their wisdom decided to call it one. It doesn't extract anything! All it is, is a supporting arm thinggy that ensured that the spent case remains against the bolt face until it's time for the case to strike the ejector. The case strikes the ejector, simultaneously the support thinggy lets go, case swings about the opposite rim and out onto the floor. If you remove that support thinggy, the case lands on top of the next round in the mag - or somewhere else downwards and you've got the makings of a jamb. No need for this guff on the No8 because you have a loading plate with an inbuilt ejector