A young boffin uses a robot double of himself to do various tasks, without telling his parents.
Even by the standards of the Children's Film Foundation, this is a painfully juvenile adventure which will test the patience of even the most ardent fan: there's only so many times you can see Roy Kinnear or the children falling into a muddy pool.
The script offers a pretty dismal and repetitive runaround, with rather too many shots of the Chegwins in their undies or dressed up as a girl. Bit weird really.
It actually seems to be a semi-sequel to The Troublesome Double (1967 - IMDb may have the wrong date for it) - one can only hope that that wasn't as inane as this; still, there are nice shots of the Wimbledon of the time.
