Saw everything today and now I'm making some in-depth enquiries with the agents and getting a business plan together. Exciting times!
Your bank may well be able to supply a guide/template to help you to construct a business plan.
My advice would be this when you write it and calculate the financials: be as dispassionate as possible.
Some people fall into the trap of writing a plan that justifies their project and unwittingly skew data to achieve this.
Once your plan is complete take professional advice on its merits from your bank, accountant, people you know who run a business and are financially astute - the two do not always go together!
If everyone is giving you a big red light then bin the project and walk away.
Gung-ho rhetoric such as 'follow your dream' and 'go for it' etc are worthy sentiments but the acid test is; are you actually going to improve your overall financial position with your project?
There are plenty of 'go for it' failures out there and as a general rule these far outnumber the successes.
Good luck whichever way you ultimately jump.