For those who are wondering, I have managed to have a look at the service manual for the door handle and it is not a simple job, but it's not too difficult either. Door card has to come off, trim on top of the door has to come off, window has to come out, window regulator assembly has to come out. Then you can access the handle assembly, it is held on with 3 nuts on studs. Each mounting point can have up to 2 washers on it for adjustment. My guess is if the handle is sticking into the door too much then there are too many shims maybe? So you can remove one?
If it was one of my other cheaper out of warranty cars I would just do this myself, but I feel like you can quite easily snap a clip, lose a shim etc so maybe best leaving this for SC when they reopen from lockdown.