The Process Forum - Looking for an advert

Hi. This is more like a shrinking man advert than a shrinking woman advert, that I'm looking for, but I wasn't sure where else to ask on the site. It's a British advert from some time in the 1990's or early 2000's. It's for a device (I don't know the name of) that you can fit on a toilet, which let's kids who are being potty trained reach the toilet more easily. I know that doesn't sound shrinking-related, but the advert starts off with a guy sitting on the toilet, and a voice says "Imagine if you suddenly shrunk to the size of a toddler." Then the guy actually shrinks (the special were pretty good if I remember correctly), till he's practically failing in. The next scene shows some babies in lab coats gathered around the toilet. That's all I remember, but I assume the advert went on to talk about the product. If anyone can find a copy of this advert online then I'd be very grateful.