Well Peeps just to finish this thread.
It seems the unscrupulous ebayer did us a favour.
It worked!!!!!! car running perfect.
So anyone with an ECU that has got wet or suspected faulty there are 3 options:
1). Send it away for repair as I did (but mine came back saying was ok when it was not, money been re-embersed) Is this an isolated incident I ask myself or is ECU repairing a little hit and miss?????
2).Look for second hand ECU (must I STRESS MUST be exactly same DDE NNN part no. to be absolutely sure you get a compatible ECU, number will be on side of ECU), EWS3(Immoboliser) and car key with transponder, ensure is off the same car, the car was a runner prior to these items been taken off. The transponder by the way is in a compartment within the key fob when you open it up, small and black it is.
PS. Be wary you don't get the Glow Plug Relay instead of the EWS3(IMMOBILISER) as I did, as relay is in same compartment as ECU in the plenum chamber compartment and looks similar so can see why people may think its the EWS3.
NOTE: This method may require an auto locksmith to sync the rolling bar code from your original key to the EWS3 immoboliser, this was the route I was going to take(but got a glow plug relay instead) so have not personally tried this myself.
3).Purchase a 2nd hand ECU with exactly same DDE NNN number, got mine for £50, then I personally took mine to ACE Diagnostics Graham 079567 631491 www.acediagnostics.co.uk
you will have to disconnect ECU from car and either send it to him or if local he will pick it up or you can drop it off with him and for £80 he takes all data off your non serviceable ECU EPROM and blows it into your replacement 2ND hand ECU. Beauty of this is all your car VIN, rolling bar code and various other car data is still the same. I simply connected my replacement ECU into car and she fired up straight away, and both keys still worked.
The guy so easy to deal with, very knowledgeable, points out any pitfalls first and offered free of charge a I was local to come out to car if after I'd connected ECU it did not start, truly superb service, always returns calls, highly recommend.
So 2mths later having tried following using my car as donor (MG ZT Diesel)
under bonnet fuel pump
under back seat fuel pump (was faulty by the way)
fuel pressure sensor]
clamped fuel line back to tank from injectors to see if was injector leak back issue
sprayed cold start into inlet, started and ran for a few seconds (shouldn't do this or bump start cars so I have been told)
disconnected Fuel Rail Sensor electically, (this bypasses sensor and car goes into limp home mode but at least starts)
Didn't check high pressure pump other than look for leaks.