Young Drivers
They do a course (you can book a one-off as a fun trial) of driving lessons for younger teens/pre-teens.
There is a height restriction as well (IIRC 1.5m)
DS had a 30 minute lesson, really enjoyed himself (and was surprisingly sensible 
)
My DS is nearly 13yo, so for him it's not a serious practice before the Proper lessons start.
But his age is bally awkward to buy for, so worth a look at.