Well, many thanks to all of you for the collected expertise!
I take the point about the viability of an installation in commercial terms, though the current edict from government to the mobile phone operators to fill in the gaps in the coverage map seems perhaps to point the other way. We'd be pleased with 2G never mind 4G!
Thanks especially to John Haine for the link to "The Phone Mast Company". I've just spoken to them and they seem like just the connection (pun intended) we're looking for. However their advice at present is to do a Brer Rabbit ("sit tight and do nutting" ) as there is some complication introduced by new regulations. If I've understood correctly it amounts to the power of compulsory purchase on behalf of the service provider. Not sure how that's going to work with a Church dating back to the twelfth century, but heigh ho. If Vodafone want to buy our church and pay for a new roof that seems like a result. But the world doesn't work like that!
Best rgds to all, and again, many thanks for the expertise and generosity.
Simon
edited to evict a winky yellow gargoyle….
Edited By Simon Williams 3 on 16/04/2018 12:42:48