Westley Richards do seem to often position the rear sight way back.
Webley got it right IMO as far as the rear sight location goes, which is just back fom the front of the fore-end.
But then, Webley got pretty well every thing else right with their double rifles anyway!

Rear sights on doubles don't worry me too much however.
The front bead is more important to me, as is correct gunfit.