Back in 2002/3 we had to fight to keep it when we moved to the new tower at Farnborough; we were successful; it's an essential tool when operating non SSR equipped traffic whether inside or outside CAS, and when an aircraft below SSR cover has a problem you can 'home' it towards you until you get radar contact. It certainly saved situations many times for me at Farnborough.
To true Chevvron - absolutely essential when providing LARS / Radar services in Class G airspace: Enables rapid identification, and timely traffic information to others, on those non transponder equipped customers
It's on our wish list for the install at TK
