Well indeed if you look at the book, as long as I'm not on a vector.
MATS Part 1 S1 Ch 5
13.2 Radar controllers have no responsibility for the terrain clearance of, and shall not assign levels to, aircraft:
a) in receipt of a radar information service when not subject to radar vectors or
So how can approach control be operated by a "radar controller" who is required to separate participating IFR flights if he cannot assign levels?