<< I'm not up on garages in Kent but I'll move this into the Kent Scoobies Forum and I am sure they can help.
If your still struggling contact Xtreme Scoobies here in Essex they are a good bunch >>
It doesn't have to be Kent, South London will be fine. Any Garages you know of there? Up until a few months ago there was a Subaru Main Dealer 10min away (Spring Park Motors) but its now a Renault dealer I would've used these just for convenience.
Cheers