Yes. Contact our technical desk. Drawing on our experience of resolving tens of thousands of financial services complaints, we can give you an informal steer on how the ombudsman might view certain issues. This may help you sort out your client's problem informally at an early stage - saving time and effort all round.
Please bear in mind that informal advice from the technical desk will be based only on one side of the story - so it is not binding if the complaint is later referred formally to the ombudsman service.