SAMPSON (tracking and fire control), S185M (long range 3D air search and track), and ARTISAN (Short-to-medium range 3D search and track) are the three big ones. The first two are on the T45s while the second two are going to go on the CVFs, and the Last one on the T26s.
All three Radars can be found (along with a host of others and auxiliary systems) in the
RN Weapons And Radar Sheets Thread