not sure this is what you need but it's one of the numbers on the website:
Contacting the Cambridge Diet
For further information about distribution of Cambridge in the UK, please contact:
Cambridge Health & Weight Plan (a division of Cambridge Manufacturing)
Clare House, Hunter's Road, Corby, Northants NN17 5JE
Phone - (44) 1536 403344/Fax - (44) 1536 202396
e-mail - [email protected]
If this is not right surely they will be able to give you the right number.