As far as I'm aware, there is no specific reference to this in the legislation, however the keeping of minutes is covered by paragraphs 41 and 44 of Part VI of Schedule 12 of the LGA 1972. These confirm the requirement to publish minutes of the proceedings and to ratify them at a subsequent meeting. Check the terms of reference for the committee to see whether they ratify their own minutes or require the Council to do so. If the ToR do not include a specific power to ratify, that power doesn't exist and the Council must ratify.
Ask the Clerk how he or she would respond to an FOI request for the minutes. If, as you say, there was no confidential element to the proceedings, there would be no exemption under FOI, so the information would have to be provided.