Yeah, Ive just been on the Australian War Memorial web site, and there is no evidence of that TLC (GP).
The only RAAF unit that I know of i that operated P51's in Europe/Med was 3 squadron, CV their code.
I have a B&W photo so its hard to tell the colours, except to say that it looks like the standard RAF colours of the period.
Having said that, it would be good to have a historically accurate RAF coloured P51.
Regards