Very cute, nappyaddict!!!
You generally don't need professional shots for assessment - they just need to be clear. Depends on the agency, though, as some have very specific requirements (which is why I didn't apply to Alphabet Kidz, as they insisted on photos of DS in a white t-shirt against a white background and it was too much trouble). Most agencies say they can tell from your own snaps if your child is photogenic or not.
I sent a combination of the professional photos and some of our own to all the agencies. I cropped and brightened our photos to make them a bit more impressive and focussed on DS's face. If you want any help doing the same with yours, let me know. This is the photo that started it all (can't seem to upload pics to Mumsnet) but I sent some that I took myself too.
I also ruled out Kids London as they won't accept photos over email and I don't tend to print pics.
Thanks for the tip though, Tinkerbel - DS has been accepted by Bonnie & Betty now too! I've never heard of them before - are they any good?
So we've got 5 offers now: however will I choose? (Haha, it's a hard life, isn't it?)