That sounds like an unusual experience ;-)

To be fair, I get a lot of press releases, newsletters and bulk mailings. But there's really no excuse for Gmail to keep putting emails from, say, EE Press Office in spam when I take them out every time. (My account was an early beta.)

I don't think so, there are multiple posters here who mention how good the spam filtering is. I don't know anyone else who has any issues with it. 30% seems an implausibly high figure.

I have screen grabs that prove it, though they probably contain other sensitive information. Not sure of a good way round that....