So far I have used the following phrases in conversation with soon-to-be-former-co-workers who are wishing me well in my new job;
'Right-o, see you now'
'Ah... have a nice life'
'Yep. Yep. Yep. Thanks a lot.'
'Smashing. Right. Good luck.'
'Deadly. Right. Go away now, please?'
'Ha ha, I'm getting out and youre still stuck here!'
'Er, is it home-time yet?'
I am exceptionally bad at small-talk. And big-talk.