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Rich_G
Think TrainerRoad rate the Road Machine and have a pretty accurate virtual power curve for it - that's where they take the wheel speed and estimate your power from that. You'll still have the variable of tyre pressure / roller-to-wheel pressure though.
I'd look out for a second hand direct drive smart trainer on ebay or here, or if that's a bit too much look for a non-smart direct drive, like the Muin. If you do get into it, you can always get a powermeter later which will work with whatever turbo you have, and outdoors. I managed to get a set of Rotor Inpower cranks for £150 - if you set up searches etc on ebay something will turn up eventually.