From "About the Author" in Deadly Reunion:

I took on the job of being the producer of Doctor Who just after Jon Pertwee became the Doctor, with the intention of staying for a year.  Not only did that stretch to five years but, astonishingly, here I am still involved thirty-four years later.

In fact, what with radio plays, books, and of course conventions, the good Doctor has been my companion, on and off, throughout my time as producer and director of the Sunday Classic serial on BBC1 (Gulliver, Alice, David Copperfield, for example), which I did for twelve years; and my time as a freelance, directing Brookside and EastEnders and teaching young directors; and the last ten years when I've concentrated on writing.

I've thoroughly enjoyed meeting the Brig when he was a young officer, and introducing him to some of my experiences in the navy just after the war.

'Good grief!' as the Doctor would say - am I that old?  How time does fly!