if you fill in a variation form and provide evidence of why you need the conditions changing or removing it should not be a problem providing you don't want to do anything to daft. I recently changed mine and i filled in a variation form and i also wrote a covering letter
this was what my sponsor wrote for me (well i wrote it actually, he signed it) - ticked all the boxes
Following my previous letter, releasing Mr ??????? from my supervision, I write regarding his request to be granted an “open” certificate.
I can confirm that Mr ?????? has demonstrated competence in all aspects of rifle shooting both whilst under my supervision and since being released, and is fully capable of determining if land is safe and suitable for use of firearms.
On this basis, I fully support his request for the restrictive condition being removed from his certificate, and the certificate being made “open”.
Should you wish to discuss this matter, please do not hesitate to contact me