Who is Barbara going to shop with?

(Telephone rings)
Tom: 4010625?
Barbara: Hello, is that you, Tom?
Tom: Hi Barbara. Have you decided where to go tomorrow?
Barbara: Yes, that’s right. I want to go to Camden Town to shop.  Would you like to go there with me?
Tom: Yes, I’d love to. That’s a good market. Tim and Mary are here with me now. They want to go there too.  Shall we meet at Camden Town Station?
Barbara: OK.  How are you going there?
Tom: We will go there by bus. It’s only three stops from my place. Well, we might walk there if the weather is fine. How will you get there?
Barbara: I think I’ll have to take the underground. I’m at Bond Street and I’ll take the Central Line first and get off at Tottenham Court Road.
Tom: That’s it. Take the Central Line and get off at Tottenham Court Road. Then you take the northern Line to Camden Town. It’s only about four stops. Make sure you get a northbound train though.   You take northbound train to Camden Town. OK?
Barbara: OK. I think I can find the way. I have an underground map with me now. What time shall we meet tomorrow?
Tom: How about ten thirty?
Barbara: Well, I think that’s a bit too late. It might be crowded by that time.
Tom: How about one hour earlier?
Barbara: Fine. That will be all right. See you tomorrow.