have a wee search on the internet - there are lots of self-drives around as well...depends how far you are transporting from? Hoof Move is good but VERY expensive. But a lovely, lovely lorry and woman.
These people are brilliant. They are near Tun Wells, but do the whole of the UK and are very reasonably priced. The lady who drove my two gave them a fantastic trip and was really professional. http://www.ashdownhorsetransport.co.uk/