Have 20 working days passed since your follow-up question, Dave? No public organisation can arbitrarily decide not to answer a FOI request put to it. If the deadline has passed without a response, there is only the option that the information was already due to be published within that time period, but the organisation also has to state this in the response. And of course, failure to publish by the agreed stated date would constitute refusal of disclosure.
If the deadline has passed, you are also entitled to request a review of the handling of your FOI request -- normally this is to request the release of certain information which you asked for but was withheld (and the original answer should state this and why, with respect to the FOI Scotland Act) if you feel there are grounds, but a review request may also be directed at the handling process itself. You could additionally later ask to see the review report and its findings, and this would constitute an entirely new FOI request with an entirely new 20 working day time limit. In theory, under the right circumstances you could perpetuate the process ad nauseum.