Electrical shutdown during flight

[kjhkent]

Today as it was wet and unpleasant I decided to do a flight from Southend to Bilbao. Took off and climbed to 22000 with no issues at. After about 200 nm I noticed that all the glass displays became  unclear almost as if sunlight was reflecting off them. However when I clicked on each display it maximised and was clear and bright. Eventually each display became unreadable as if white out. When maximised each display was black. Eventually all the electrics shut down and eventually crashed.

Otherwise the cockpit was clear so not it would appear oxygen related.

Any ideas would be appreciated.