Hi Neddy
We had considered using Ambler Collins when we first thought about moving they were advertised in "The Sun".
On doing a bit of research though from the little info I could get people said they were very slow and dragged their heels regarding getting the process up and running.
We are now in the process of waiting for skills assesment to come back we decided to go with
www.overseas-emigration.co.uk
They have been fantastic kept us on our toes getting paper work in, email us every time I have an enquiry and are always at the other end of the phone.
Even if you didnt use them the website is really good you can even leave questions on the site and they will answer them free of charge just look under the frequently asked questions section.
All the best
Kaye :)