Ah, probably. It's the Antonov AN2 that is mentioned in the planning document that's all:-
25 The European Aviation Safety Agency (EASA) has now taken over the certification of noise emissions of aircraft. The previous condition controlling the levels of noise of skydiving aircraft at Redlands involved a direct comparison with the Antonov AN2 aircraft originally used on the site. As there are no Antonov AN2 aircraft currently licensed by EASA and none ever likely to be so licensed, the condition has been updated to make it enforceable and prevent any aircraft using the site unless it has a current certification within the levels estimated to have been those of the Antonov previously employed.
4. No aircraft other than Microlight Aircraft (including self propelled hang gliders) and one light aircraft shall take off, land or otherwise be stationed on the site, the subject of this permission, unless otherwise agreed in writing by the Local Planning Authority. The light aircraft shall be currently certified by the European Aviation Safety Agency with a Type Certificate Data Sheet for Noise (TCDSN) showing a take off level of 87.8 dB or less.