'Blink' was fantastic, Steven Moffat at the top of his game. (Unlike Jekyll, which made me nod off.)

And as for this week's episode: *does bow-y scrape-y thing at RTD*

IWRC, there was a WW1 setting in Troughton's last story ('The War Games'), but it isn't actually WW1 at all - and we couldn't think of another instance.