I really liked Po Face too, she was my favourite officer when she was there, I loved the way she always delivered her lines really sarcastically and she was a good contrast to St Meg, who used to get on my tits.
Yeah, Judith McGrath was a brilliant actress - I bet she'd have been a great comic actress too. Meg was very bland, but I'm glad she stuck around and provided a link at the end of the series to all that had gone before.
By the way, did you know that the actress who played the second Governor, the lovely (but less formal than Erica) Ann Reynolds, had previously appeared as a bent screw (with a rougher accent!) for a couple of episodes during Bea's stint at Barnhurst? Really surreal to watch, knowing that she was later to become the gentle and kindly-spoken Renno!