What would be involved, and would it be possible to retrofit cruise control to an 05 plate sportback?
Not at all,as the forum is a tool which takes a bit of getting used to so you have to be patient with beginners.
You are fcuked though the next time you make such a stupid mistake
2003-2008 1998 Red A3 8L 1.8 Sport
2008 -> 2003 Akoya Silver A3 8P1 2.0 FSi Sport