Hi Guys
Thanks for your quick replies, I have to admit not quite the answer I was hoping for, I just wish someone had found out you could get them free with every packet of corn flakes

Seth the problem with the injector is, it was leaking where the two halves of the injector body screw into each other, so I decided to take them all out and get new nozzles fitted unfortunately in getting couple of them out I managed to break the metal leak off tubes but the company who fitted the new nozzles are also able to replace these tubes.
I have now refitted the injectors and isn’t the one with the sensor wire still leaking, so I guess the only cure will be to fit a new one.
I would have thought the leak would have shown up while the injector was under test.
Right guys this is what I’ve managed to find out so far: The Omega is fitted with a BMW 6 cylinder engine which I’m given to understand is also fitted in the Range Rover P38, mine has X25DT stamped on the side of the engine block.
I’ve been having a look on the net and found this so far
http://p38spares.co.uk/commerce/product/1984/Range_Rover_P38_Fuel_Injector_&_Sensor_25_TD_-_99-02.html price £229.99 for a Range Rover P38 MKII 2.5 TD Models 1999 – 2002 From Vin/Chassis Number: WA409250
This is for a genuine Bosch item, so I’m assuming it would fit the engine in my car since they are supposed to be one of the same and its £64 cheaper, I'm still looking, just wish I could speak German, I'm sure Vauxhall as got a massive mark up on the spares just like any other spares they sell.