If you want cheap, then you could buy a single-seater PFA-type aircraft for approx £10K. Fly it for arond £10/hr - the monthly costs will be negligable because you'll be flying a high number of hours per month. At the end, sell it, get back your £10K (near enough) and you've completed your hour-building for around £10/hr.
I'm sure others will have their own good ideas, too.
FFF
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