Hmmmm ..... all and any observations are welcome guys!
For the record, the Rest-O-Brite process comprises the removal of yellowing chemicals within certain types of plastics [primarily bromides] caused via exposure to ultra violet light. The process involves applying a peroxide based paste to the plastic and then encapsulating it in an air-tight translucent bag - then leaving it out in the sun for a few hours .... and letting the ultra violet light act as a reverse catalyst. Serendipity eh?
Sooo .... I've experimented on a spare/identical handle, and it certainly did no harm. Today is officially the last day of Summer ...... therefore, the whole case is now out there - catching the rays!
I'll let you all know how I get on ......