I don't watch The Bill, and I've not got this week's Radio Times.
But, looking in next week's issue (which refers to the ongoing story), I see that teacher Becky James is played by Naomi Ryan http://www.imdb.com/name/nm0751357/
Thanks, I recall her from Echo Beach. You cannot believe how I tried last night to find a cast list for that program. Unbeleivable how impossible it was. Thanks again.