Phase 2>Phase 3 headlights...

[InkedMuttley]

just whack em in, change the adjusters, and then work out if you need the different stalk or not. not massivly urgent, shouldn't cause any untoward wiring issues,

It doesn't. I had both single and twin optics on my XS and never touched the stalk.

What about the wiring and/or heat issues...my old Mondeo had H7 outer (dipped) and H1 inner (main) so wouldn't of thought the heat would be that bad unless you are running 100w+ crystals though I think the light beam and throw is a lot better or at least it was on my mate's old 306...