So given that the rust was becoming visible I set aside some time over the weekend to burr it out using my dremel and a miniature wire wheel, rust convert it (I actually did that stuff during the week at night), prime it, seam seal it, prime it again, then two base coats and two clear coats.
Where did I get the paint? I used supercheap auto's colour cards to get the closest match among 72,000 colours and they mixed me up an aerosol can.
I masked up 5-10mm either side of the seam as I didn't want to spray the whole lower front and the result is good - not perfect but good. You have to be looking for it.
The Vogue, missing bumper and grill, ready for clear coat. I hate overspray.
All in time to drive it to work today.