The originator of this thread provides a link in their first post for the CAA IN-2015/029 but no one seems to have read it fully.
There are no flying groups or organisations prescribed from taking advantage of the rule and this is made absolutely clear within the IN and including the FAQ and guidance section. The aircraft that may be used is also made simply very clear.
The flight must be non-profit making. Although the CAA seek to explain what this means this is not so straight forward as they wish it to be. On the one hand they say that the cost of renting an aircraft may be included in the basic cost and shared (no element of profit), but on the other hand they say the annual operating costs cannot be included; "keeping, maintaining and operating the aircraft over a period of one calendar year", all of which, it must be obvious, will be included in a rental charge
There are a number of non-profit groups and organisations that specialise in aerobatics, classic and vintage aircraft and other specialised activities that do not provide for licensing training but are always seeking new members to assist in all sorts of ways as well as flying. This rule change is of particular interest to them.
A flying club that normally conducts flying training should be very careful for two reasons. Flying training will normally amount to in excess of 50% of flying and costs will be very complex including annual costs not only of flying but also buildings, finance and administration.