Just to add my 2 cents here:
I started a nursery 6 years ago in Essex. I have a PGCE Primary and had a lot of trouble with social services (at the time they registered nurseries, not OFSTED) and had to prove how much experience I had with early years - thankfully I had a lot. Now, I was the day to day manager at the time so this was the issue. If you will just be the registered provider, it will not be a problem. Thinnk of all the large nursery chains - they are not owned by ualified early years people usually.
I agree with what has been said about planning consent. I had huge battles with my planning department. I new built, but within school grounds. I had all kinds of conditions put on my application and had to prove social links as it was on green belt land.
However, one thing no-one has mentioned yet. Before you spend any money on anything - even planning consent, you need to assess local need. I know that everyone thinks nurseries are a profitable business, but it really depends where you are. Also, as you plan to administrate and not manage, you will have the additioanl costs of a manager. Call all the local nurseries (pretending to be a parent) and find out what spaces they have avaialble. There is not always enough demand for all the nurseries that are opening up.
Running a nursery is not cheap - staff costs are high, and you can only set your prices at whatever the local market is so there is a limit to what your incomings will be.
I am not trying to put you off - just think you need to do a lot of research first.
Feel free to contact me if you would like.
Bubble99 - do you run a nursery? Would be interested in chatting if you do