Type 12 Leander class : Exocet / Seacat (7) Exocet / Sea Wolf (5) conversions
Type 21 Frigate - Amazon class (8) - 2 units lost in the Falklands war
Type 22 Frigate Batch 1 and 2 - Broadsword (4) Boxer (6)
All classes carried 4 Missiles
Edit: As Alan mentions below there was 4 units of the County class Destroyers (Batch 2) modified with their 'B' turret (mk 6 Twin Automatic 4.5" gun) removed and replaced with 4 Exocet launchers like the above Frigates.
ANTELOPE never actually received Exocets before she was sunk.
JUNO was also scheduled to recieve Seacat/Exocet conversion, but this was cancelled in the 1981 Defence Review.