I'm a complete beginner with Celtx so apologies in advance. So far as I can see Celtx does not support BBC Radio drama format scripts. I have read the answers to as many other posts on this topic as I can find but I'm still unable to produce scripts in the required way. The BBC website carries no very detailed specification, but so far as I can glean from examples and what information there is, a script should have the following format:
Scene description in bold underlined upper case and beginning on a new page
Directions parenthesised in underlined upper case
Character names in upper case followed by a colon
Dialog in 1.5 line spacing, lower case, beginning on the same line as the character name but indented from the left
It's unclear if cues should be numbered - some examples are.
If anyone is in the same fix I have a Microsoft Word template which does most of what's required, in Word 2003 or Word 2007 formats. Not ideal, but when you're stuck...
There is already a free template for MAC (http://www.macupdate.com/app/mac/28130/ ... t-template