If a part is temporarily unavailable, you could substitute it with these parts:
Quality Idle control valve, air supply for Jaguar XJ 3.6 185 hp Petrol
Wide selection of new idle control valve, air supply for Jaguar XJ40 3.6 Petrol 185 hp, priced from £17.24 to £39.56. Choose from 6 trusted manufacturers.
Idle control valve, air supply for JAGUAR XJ models
3.0 SDV6 306DT(AJTDV6)
3.2
D 2.7 7G(AJTDV6)
4.2 SG(AJ34)
6 3.2 9JPGRB
6 4.0 9EPCNA
R 4.2 TB(AJ33SC)
4.0 BC
4.0 DC
6 Sovereign 4.0 9JPFRB