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.