At the risk of sounding like this post was written by Enid Blyton or perhaps PG Wodehouse....
- Jolly decent
- You sir, are a cad and a bounder! (NB, you need steely eyes for this one)
- Rather, old thing!
Apropos of not very much, but usually when my colleague and I have agreed on a tricky situation, I like to refer to them as Comrade.