Back to the OP
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Have you considered the problems you might face by owning an aircraft that you rent out?
Have you spoken to anyone that owns an aircraft and rents it to a flying school and got an idea of how viable it is?
I reckon you'll find a great number of people aren't all that satisfied with the way things worked out for them, their planes get used a heck of a lot more and because of that the interior and the paint get a fair old beating. You also don't get the plane when you want it
. Consider also that you are signing up to a minimum of about £7k-£9k a year fixed costs before you even spend a penny on fuel. That's a lot of flying to deal with the costs relative to flying a permit aircraft where the fixed costs are more likely to be around £3k a year can often be less.
This of course is all dependent on which plane you buy
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My suggestion is to buy a plane you can afford to run without renting and is also a popular type, Piper Cub, just about any RV and see how you go from there
you should be able to sell them fairly quickly if you need to. If you buy something rare or less desirable then it can sit doing nothing for a long time (don't buy a TB!!) If you must buy a training aircraft buy the simplest one you can, Cessna 172 is a good start they do most things you'd want and they don't have oleo main gear which can be expensive and need regular maintenance they also sell quickly.