Lost black leather travel wallet in the London Underground between Oxford Circus and Tottenham Court Road containing a British Airways frequent flyer card and travel documents.

I lost my black leather travel wallet in the Underground between Oxford Circus and Tottenham Court Road during my trip to London last weekend. It has my British Airways frequent flyer card inside, as well as some cash and various travel documents. I'm quite anxious to get it back as it holds sentimental value, so if anyone finds it, please get in touch!