Scandalous Lady
I think Keeley is such a beautiful actress and she comes across as so classy in Upstairs Downstairs, but when I went on to read her wikipedia page I found her personal life pretty scandalous.
It says she had a son before marrying her first husband, then married him and left him 8 weeks later in 2004 for Matthew McFadyen. That means she was having an affair from the start of that marriage. Then in November 2004 she married M and had his baby in December, 2 months later. That means she was pregnant in March 2004, so if she met M in 2004 she must've hooked up with him and gotten pregnant like the first 1-3 months of knowing him. That's crazy!
Does anyhow know more details?