Punter said:
Brilliant, thanks. Just a bit wary about trying it myself!
If the bolsters have holes

, you need a professional. If not,
Gliptone (a.k.a. Liquidleather, Scuffmaster & Automate) products are very good. https://www.liquidleather.com/
From my experience (on a 911, two Jaguars and the Ivory Nappa Z4, for example) ...
1 Gliptone colours are true, although they don't look it in the bottle
2 Scuffmaster dye works very well on Alcantara (The best cleaner for Alcantara is the
aerosol -
not the liquid in the bottle in the kit - leather cleaner from BMW/Sytner)
3 On leather, especially bolsters, Scuffmaster needs several repeats to be very good
4 Obviously, don't apply the gloss until you've finished and then only a little
5 Scuffmaster works on plastic
6 On undamaged but dirty seats, the Leather Conditioner 'washes' muck off
7 (Undamaged) leather needs humidity. Just wiping it with a very damp cloth helps a lot.