MrsBri, 25 weeks sounded too late for my liking too; as I said, my work wanted to know my maternity leave start date as soon as I informed them I was pregnant (I ignored them until after the 12 week scan, as I didn't even have an official due date until then!), and said they wanted the MATB1 asap. They'd definitely have started harrassing me if I'd had to wait until 25 weeks!
I found out today that I can use all of the annual leave I'll accrue on maternity leave before I go off on maternity leave if I want to! I won't, as it'll be handy to be paid for it at the end, but it's very tempting (I could finish in just over a month!).
I am lucky with the maternity package where I work; I didn't realise that many employers just give the minimum.
I'm glad to hear all the good scan news and good luck for the upcoming scans.
Lexi, I think faces on the normal ultrasound scans are freaky looking! In one picture, my baby turned her head so her face is front on, and it looks so scary (luckily we got loads of other pictures)! I've seen her face in 4D and it does look normal, thank goodness 
Sarah - yes I am! I can understand why the other girls you work with are starting maternity leave early. My department is also changing, and I'm just hoping it won't go ahead as early as planned (it's already been put back by a couple of months). I hope it works out ok for you.