For all those that are still interested in my bearings seizing up.

I placed my reference bearing in my freezer at a temp of -5degC for 1 hour.
on taking it out, it was indeed stiffer to turn. It took about 2½ hours to return to room temp. So you see my calculation was about correct, the bearing will work over the accepted SRT to about plus/minus 20degC although I do not believe anybody would want to play their SL1200 on a snowy winters day in the garden.
The reverse will obviously hold. That the bearing will free up (not seize) when placed in a warmer environment.

On another subject;
For all of you who have purchased one of my bearings would you please email me your name and address. If not your address then the country you live in.
The reason being, is that I would like to have a record of all my bearings sold, so that I can if needs be support all of you in the future.
Thanks Mike