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I've spent the past two days writing the script for the third programme in the Blueprint series with the producer, Natalie Maynes. We escaped Broadcasting House, as we did yesterday, and worked at Natalie's home like two students trying to finish a joint assignment before the deadline. Every so often, the outside world would interrupt -- phone calls from broadcasting assistants asking about guests for Sunday Sequence or a producer desperately trying to book accommodation in Edinburgh during the Festival so that we can film some sequences there -- but mostly it was a writing bash.

Natalie is still at work on the script while I write this, and I'll return to it over the weekend. By Sunday, we plan to have a decent draft for Paul McGuigan, our head of factual TV, to pull to pieces. Others will also join the fun on Tuesday at a full-day script review meeting. Then we continue that process, including detailed feedback from our panel of academic advisers, until we have a finished script ready for filming at the start of September. TV is, to say the least, a collaborative business.

Today, Natalie and I were incorporating some material that may raise the odd eyebrow in the TV audience, including the consensus among scholars that the "Celts" never existed as a distinct race -- instead, the term "Celtic" connects various European (and some Asian) people groups through language and culture. Natalie can answer all the letters.