Section from Episode 2 "Circle of Fear" where Matthew examines the "Quod Non Est" painting.
Some wag has encoded the entire series of COTS and put it on YouTube. This is highly illegal, and apart from that is a nasty way of watching the show, since it has been split up into three sections per episode. Use these links to check out bit of the series for reference, but if you want to watch the show properly, invest in a DVD.
Warning! These links will probably stop working as soon as YouTube realise these are illegal clips of a copyrighted show!