I couldn't find the Office ones I liked, so I tried on these, which are far, far nicer than they look in that photo. I just couldn't get them to fit properly -- my foot slid around inside them, even in a size 4 (am usually a 5). I almost bought them anyway, but I'm glad I didn't because I'd have been super pissed off to find they've been reduced by £30 now!
I got some in Debenhams instead, but can't find a pic on their website. Also fell in love with these, but couldn't stretch to both