Sleep consultant in Sussex - any recommendations?

[boopdoop]

I live in mid-Sussex, and have a 21 month old DS who is a horrendous sleeper. Previously had a great HV who was a sleep specialist who really helped us about a year ago, but she's moved to a different area and the other HVs are useless. And I need help, and I don't care how much it'll cost. So I wondered if anyone has any recommendations of sleep consultants that you have used, around Sussex? TIA.