We generally take the view that a complaint could be the personal data of more than 1 person. So your situation is a mixture of a subject access request by the person complained about for his/her own personal data and a FOI request for the information contained within the comoplaint that is not his/her personal data.
In relation to the person who is the subject of the complaint, it is my understanding that the DPA does not give any right of access to a specific document - only personal data. So the person may not be entitled to a copy of the complaint.
This leaves the FOI element in relation to the remainder of the information contained in the complaint letter. In relatioon to the complainor from what you say I don't think that the DPA applies in any way unless you can identify the complainer. However, I would be wary about releasing the letter if it was handwritten as this could lead to identification of the complainor even if you cannot do so (the recipient might).
If there is no way to identify the complainor, we are looking at the common law of confidentiality between you and in the complainor. I think that for the duty to apply there must be clarity about who the parties are in order to bind them. Consequently, if you cannot identify the complainor and believe that it is not possible to identify the writer in any way i.e. it was typed then the duty probably doesn't apply.
As an aside, you mentioned that there is reference to a third party in the complaint, this would be their personal data and not the personal data of the person making the complaint so it may be appropriate to exclude that information using the personal data exemption in FOIA/FOISA
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