Agreed. Meltchett's advice is spot on because 9 times out of 10, they'll start going off on a tangent from your topic to another one - if you read a broadsheet/economist/the week cover to cover you should be covered
I'll give an example - I spoke about Trident as one of my 'home' topics and ended up talking about Iran and the nuclear threat as a result. Then from Iran I think we ended up in Israel
