Hi Rebecca
I dont think the property is available for public worship based on what you have described. If anything they may meet (i) but if its fenced I would seek some more information on services conducted or (iii), again better particulars would be needed.
In these instances I would seek evidence to support the claim, a lot of religious institutions feel just being a religious institution is enough for an exemption and that is not what the legislation says.
Hope you are well and keeping safe.
Regards,
Andrew
