The L96 has a new Gucci ( OK, Schmidt und Bender ) variable sight with stadiametric rangefinder. It looks ( and is ) substantially different from the old 7x42 sight, more akin to the sight that the USMC use - and they are expert snipers.
The AW ( Artic Warfare ) variant is a development of the otiginal L96: one key improvment is that it can fire rounds more rapidly ( Not RAPID FIRE ) without the bolt becoming stiff.
The L115 is a heavier version firing 8.59mm, accurate to longer ranges and issued to selected units. I wonder who that could mean. I think that RE EOD teams use it to dispose of unexploded ordnance