Interesting discussion guys. :)
I think Kat and Alfie must have done as Dan suggests and got a mortgage so they could keep hold of their capital. Even if interest on the million didn't pay for the bar they were probably hoping the bar would pay for itself (and their new home) so they could keep their nest egg intact.
The trouble is, as several of you have pointed out, it's just not in character for them to be so sensible (especially given the speed at which it all happened)!
Talking of finances, it's always bugged me where Mick got a bagful of cash (£800,000 was it?) to pay Phil for the Vic. Since it's never been explained or even alluded to the writers must just not want us to think about it too hard!
http://www.picgifs.com/smileys/smile...sed-140297.gif