There are several UK/Boxster owners on this forum who will chip in with suggestions.
Being originally from the UK and am familiar with tyres and tires, London is a big city and I am sure there are several retailers there. It is ideal if you can get a recommendation for an installer that someone has personally used. I have not had new tyres installed in my Box yet but even with standard Box wheels I do not want them scraped during installation. I can do that myself parking it LOL.
