Yeah, that was my first thought - I've gone through all the pages and there's no spaces where there shouldn't be.
I'm thinking this is something to do with the server 'cos it's an intermittent problem. To safeguard against this happening again does anyone know how to 301 redirect something with a space in it (htaccess), I've tried:-
redirect301 /%20mypage.html
http://www.mysite.com/mypage.html
and
redirect301 / mypage.html
http://www.mysite.com/mypage.html
but both don't work.
I'm stumped on this one.