Ian
Have a word with the guys at Eastern Counties police Maintenance at Wattisham, they look after 3 of them so should give you a good steer, less the police bits of course. Also discuss the differences in owning P&Ws or leasing Turbomeca/PBH/SBH etc...I know they've been leading the trial on extended maint schedules to 500/1000 hour with G-ESEX rather than the 400/800.
A good machine with very mechanical few issues these days!