Please note that the General Exemption pertaining to the use of a Medical Declaration with a CAA-issued non-NPPL, 'ORS 4 No 689' has now been superseded by 'ORS 4 No 711' - see
http://www.caa.co.uk/docs/33/ORS4_711.pdf .
This now spells out quite clearly what the restrictions are; later an Advice Circular will be released by the CAA to spell out further the effects to those who are still in any doubt!