Hi Neil
re: voltage drop - yes, I picked that up from your first post. It's well worth noting, and something I'd not considered until now. However, I don't *think* it's a problem - but I can easily double check. Even if it does, it's not a huge issue, because the kids just whine for the few seconds it takes to reboot and restart the movie. That's better than them whining for the entire time that I'm in the shop and then having to manually restart again

re: the maplin circuit - it *looks* like it will do it. But that question says, "off after a few seconds with the 12v feed still being applied", whereas my circuit would require it to remain on for a few seconds after the power has been released.

It actually has to stay on irrespective of timer as long as the power is released, and specifically NOT shut off "with the 21v feed still being applied".

I'm not clear whether that answers my question - I'll post the question on the maplin site....