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Hi Jeremy.
It depends on how fast you want it to move. If the answer is fast and you want to run direct drive then the motor has to be quite large and powerful. If you're happy to have it move slower then a high RPM but weaker motor with gearing will do the job. I don't know about in the UK but there are electronics shops over here that sell the motors and then variable gearboxes that you can use with them.
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