I suggest you re-read the Appendices to the AIC VERY CAREFULLY. Especially the bit about flights no further than 25nm from the aerodrome and being local flights only - NOT landing away.
Are you sure you really want to be looking at charity flights, where YOU pay for the flight and the passengers make a donation to a registered charity, or Cost sharing - which is totally different, and the rules for that are contained in the ANO (No more than 4 pob, costs shared EQUALLY between all on board).