Any oral or written expression of dissatisfaction, whether justified or not, from, or on behalf of, a person about the provision of, or failure to provide, a financial service, which:
(1) alleges that the complainant has suffered (or may suffer) financial loss, material distress or material inconvenience and
(2) relates to an activity of that respondent, or of any other respondent with whom that respondent has some connection in marketing or providing financial services or products, which comes under the jurisdiction of the Financial Ombudsman Service (FOS) in the UK