Rover 75 260 Help needed

[Alex]

Hi Everyone
I've just joined this forum, i have owned my Rover for about 3 years now and it developed a problem about 2 years ago that no one has been able to solve.
Many people have tried and I've have no luck fixing it.
I run a garage in NW London, but have not been to well this year, and have had to time to sort this out, and now want to get her running again.
Intermittently she wont start, when trying the fuel pump is not working, not sure if spark is there,it turns over but wont start. Leave it for a few hours and it will run again.
There is no pattern to this but I know when it wont start as I have found that if you switch on the ignition without starting her, and place the auto shift in reverse, if you hear the beep from the reverse parking sensor as it goes into reverse, it will start, hear nothing and all it will do it crank but not start.
When its running it never cuts out, so consequently any journey is a challenge, you can't turn off for fear of non start. Refueling is good fun, leaving it running, have to take the spare key to lock it while you pay for fuel.
Recently I took it to the Rover guys in St Albans and they think its the gateway ECU,which allows the Rover ECU to talk to Ford and BMW ECU's, it's part no is NNN 000710 which is now NNN 000850 they sent it to be tested at AC Tronics, and think its faulty.
They can't repair it as they have no specs for it.
It is located behind/under the glove box area.
Now this is my question, as this ECU is different on the Rover as its Auto, is there any kind soul out there that will try this ECU out on their car to see if the fault is replicated, or if they have a spare one can they lend it to me PLEASE so i can get my car back on the road where it belongs.
I will gladly come to you, I am in NW London based.
Please get in touch with me by email on info@gdkgarages.co.uk or call me on 07809 506650 or via here
Have i put this in the right place?
Thanks in advance
Alex