Haven't seen you around recently (despite intensive lurking) but if you are, and if you're still moving to Audley End, then I have a top tip for you.
Which is...a lady called Paula at Apricot Nannies. Diamond geezer, has moved heaven and earth for me to try and find unfeasibly cheap but wonderful nanny (see my rants passim). She's not succeeded yet, but I promised her a recommendation on the strength of her obvious commitment to my cause, and it occurred to me that you might be wondering about agencies if your big move is still happening this spring.