If you hear nothing after 20 working days, ask the Town/Parish Council to hold an internal review into their failure to respond to your FOI request within the specified 20 working days. In that message, also inform them that if they fail to respond after a further 20 working days to inform you what is happening with the internal review, you will contact the Information Commissioner (ICO) to lodge an official complaint and request the ICO intervenes on your behalf to make the Council provide the information you are seeking. Keep us posted.