Yery nice!
I have one of the panels from a 121 class at home, wll, in my dad's shed! It was autioned off by the ITG some years back to raise money for their loco funds.
As far as I can remember, it is from 126, and has 'Suitable for hauling air-braked trains' on it.
I must ask him to pop it in the boot the next time he is dropping over to me