If you still have the vehicle, I sell the solenoids including the converter lockup solenoid, for BM gearboxes..if you have a UM box, I can get parts, but will be a few weeks.
https://ebay.us/m/PX22Ni

Hi all, I made a new pdf, using the info from the original and added pictures to help users. If interested, its here..
https://drive.google.com/file/d/14TgL08coQtWHdifq1bF-W7-Y0GMM69SV/view?usp=drivesdk
I'm also selling on ebay, transmission filter and gasket kits, diagnostic test leads and also ...

As its a diesel, it doesn't have an engine ecu, per se..use the settings for the auto gearbox and it will give you the codes from the ecu

Oh wow, I'm so glad I found this..I've had exactly the same intermittent problem..started when we were away in Wales luckily it repaired itself to get us home, but it's had me stumped since. Can I ask was it the ecu behind the glove box you changed? I'm guessing that's the only one? WL04189E1A?