I have heard of Pinnacle Property Management, as far as I know they are an ok company.
However what kind of services are you looking to use them for?
DJC Property Management Limited
t: + 44 (0)870 481 0110
Registered in England Registration Number 6243275
Registered Office: 87/89 Park Lane Hornchurch Essex RM11 1BH
Trading Office: Imperial Park, Rawreth Lane, Rayleigh, Essex SS6 9RS