Hi Esther
By naturalist does this essentially mean the same as humanist in your understanding? In the various MHs I've been associated with I've had requests for both humanist/naturalist funerals and weddings i.e. non-affiliated to any religious group but wanting spiritual/ritualistic elements throughout that may not be acceptable at registry offices. Funerals: there haven't been any issues, they've just been treated as any other booking. Weddings have proved more problematic for some Meetings and not for others, and over time the reticence seems to have lessened.
There was (is) an understandable worry that QMHs would be viewed as secular and that we, Quakers, would potentially lose our 'privilege' of being allowed to marry without a civil registrar present or in a registered building, this seemed to be of particularly more concern before same sex marriages became lawful. Any marriage/wedding that takes place in a Meeting House, other than a Quaker marriage, is not legal (unless the Meeting House is specifically registered for weddings, but I don't know of any that are), so the couple would still need to do the legal bit elsewhere. Some Meetings have wanted to consider the request and meet with the couple before making a decision. Some Meetings have just treated the wedding as any other booking, within the guidance set out in the usual Terms & Conditions.
Hope that jumble of thoughts is helpful?
Good luck
Tasha
Natasha Heny
Warden
Lancaster Quaker Meeting House
(My days off are Friday and Saturdays, and I work flexible hours between 08:45-19:30 Sunday to Thursday.)