The intake manifold has to come off to replace the glow plug controller - RHD makes no difference here.
After 150,000km, I'd replace the glow plugs again too, while you're in there. Just get the full kit.
Not sure what's up with the LEW and SRS errors. Does your SRS warning lamp show up on dash at startup?
The IKE error - brake-force distribution - is very common and may be a phantom error - mine has this too, although it comes and goes. Last scan it was gone again...
Some folk have resolved the IKE brake force error by replacing the lateral motion sensor under the centre console - but it's not a sure thing. The error doesn't appear to cause any problems, as far as I know.