Hey Experts (this means you Channa)

I need some help. Been racking my brain trying to figure out a worthwhile run. I will be traveling to London from 7/14-7/19. I will be in London on 7/16. Looking to do a side trip that will earn me CO miles. Every option I have looked at has come up blank. I can basically travel any day except 7/16. Prefer evening flights returning in the morning. I know its going to be tough but I hope someone can help.
Thanks in advance