I know it would have ruined the whole effect, but they could have had fun with that in S4, Rose arrives back and the first thing she says (assuming a dalek doesn't interrupt) 'Where's my ten quid?'
Or, after the TARDIS left Bad Wolf Bay, Rose asked TenToo where her ten quid was?
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Or, after the TARDIS left Bad Wolf Bay, Rose asked TenToo where her ten quid was?