The term 'Psychosexual' simply means 'sexual matters related to the mind'. All the therapists who have completed training in these matters with Terence Watts personally can be found here. if you enter 'sexual' into the search box on that page, you will see them all listed. They all carry professional indemnity insurance and abide by a strict code of ethics, so your confidentiality is completely assured.
Fees: All therapists run their own practices and it is not possible to state definitive fees. If you contact any one of them, they will be happy to discuss fees, numbers of sessions and so on (all can provide brief therapy) and most will offer you a no-obligation initial assessment; there will be no charge for this if you elect to undergo the recommended therapy.