Ben Jackson:  You know , it 's little things like this that make it difficult to believe that you 're the Doctor .
The Doctor: Ahh .
Ben Jackson: The other one , I mean . The proper _ one _ . Oh nuts , you know what I mean .
The Doctor: Nuts ? Yes , certainly , here we are . Crackers ?
Ben Jackson: You , my old china , are an out and out phoney !
The Doctor: China , yes , I went there once I believe . Met Marco Polo !
Ben Jackson: No , not China . China ! China and plate , mate , friend .
The Doctor: Yes , Marco Polo a friend ? I believe he was .
Polly Wright: Do n't listen to him , Doctor . I know who you are .