You seem to forget, TARDIS is fully capable of travel in ALL directions & dimensions.
The only directives given to me by the Council of Time Lords, is that it cannot be used to CHANGE history, or for evil, personel gain. Within those parameters, Geesie going shopping is quite harmless.
All in all, a nice prize for winning a game of Baccarat. And the on-board pool table with the gyroscopic stabilization modules at each corner......there is NO better, flatter table in the entire Universe !