I had this issue when applying for my PPL this year:
" When assessing your logbook to confirm the relevant flight training hours have been met we have found you are claiming flight training conducted prior to September 2012. Although your supervised solo, solo cross-country and dual instruction flying experience after September 2012 is sufficient, unfortunately, we have only been able to identify 42hrs 55mins of total flying time out of the required 45 hours.
"
So any of your hours before September 2012 cannot be counted.