I have been in Prague for a few days. This is a city I keep coming back to - and which always turns out to be delightful. Especially the old city is magical. I'm here in the centre today to look up an old friend and colleague, David Vauhgn, formerly the editor in chief ar Radio Prague. David has a fascination with history - and that includes the history of Czech broadcasting during the momentus times before, during and after the Second World War. The old city is expecially magical - and mysterious - at this time of year.