Any advice on what to fettle first on a 400 4?

That sounds familiar. That's where they always corrode away.

The right thing to do.

 

It's all ready for its MOT free retest now.
Bloody computer system means it has actually got to be booked in because
the system waits 40 odd minutes before spitting out the certificate.
Tester only needs to see the new shocks on the back...
Anyway, I have managed to find a sound albeit scruffy rear mudguard
I'd quite like to get it rechromed along with the chainguard and the
front mudguard. I've never had anything chromed before.
Beyond cleaning the rust off is there any other prep I need to carry
out?
Can anyone recommend a place that can do this work?
I live in Brunstrom land......................
Cheers.

 

Yes. It really needs to be taken back to bare metal and polished
properly. If you just scrub the rust off, it'll be rechromed but every
little bump and imprefection will show.

The actual chroming isn't the time-consuming and expensive bit. The
metal polishing and preparation is.