Apparently "limited" was the polite answer to the experience
Not true.
I would suggest that posters refrain from speculating or pre-judging on the experience or otherwise of the assisted pilot in this case, until the full facts are actually known.
Fact 1- aircraft gets caught in turbulence with loss of control
Fact 2 - one disorientated high-houred instrument rated pilot
Fact 3 - situation stabilised, ac climbed, pilot reassured and vectored over sea
Fact 4 - ac gets VMC and is shepherded round coast to Campbeltown for RV with chopper
Fact 5 - ac lands safely at Prestwick
Impossible to prejudge how anyone would feel if they had lost control in turbulence. Even if you were a multi-thousand hour IFR rated pilot, a scary moment like that needs VERY careful handling. I doubt I would want to lose sight of the horizon and go back into cloud ... or spend a night in Campbeltown
...
(Actually come to think of it, the last time I spent a night in Campbeltown it was very turbulent and exactly like losing sight of the horizon and going back into cloud ... 
)
Anyway, pPruners weren't in the cockpit so it's not our call.