F355 buttress repair - Cambridge/Essex Bodyshop Recos?

[Attwooj]

Title says it all. Buttress just starting to go and want to get on top of it.
Any recommendations? I’m near Saffron Walden and would prefer not to trailer it if possible.
Also, do I have the whole resin fill dug out or go for superficial? No bubbling
So far, just a stress crack.
May be a piece of string question but worth asking.
Many thanks in advance.

[Gameface]

Grimaldi Engineering in Halstead.

[Attwooj]

Thanks Gameface