Job dilemma

[Niall]

Well I've been told this morning that there may be a chance of a promotion for me seeing as one of the guys above me has handed his notice in. The job was available at the beginning of the year and they offered it to me but I turned it down due to wanting to get on the course I'm on. Well I'm on it now so they won't take me off it so the new job sounds ideal right? Really not sure!
In the next few years I want to get away from London and me and the misses were going to move down to Hampshire. Used to enjoy working in town but I the it now. If I take this job, there is less of a chance of me being able to move down south. In fact, this new job will mean I'm solely in London. Pros for it are its a lot more experience under my belt, a tidy pay rise, part of a smaller team and less stress but I still can't get over the idea of not getting out of town as quickly as I wanted. I could take the experience and then in 3 years time, go to another company down that way but moving jobs and house at the same time is very difficult (and the misses will be having to do that as well!). Opinions? I'm expecting a call in the next few days inviting me to an interview (formality of the company - the new team manager wants me so I've got the job if I want it)and I really don't know wether to go to it or not!