This cache will involve a bit of research or luck to accomplish, as any church buildings such as the many cathederals that open their towers regularly as tourist attractions are disqualified as they are too easy!
To score this cache, you have, by legal and safe means, to get a picture of the view, and a GPS reading including height from the top of a church tower.
Many of them open occasionally for church fete's, or in the case of the church close to one of my other caches, on the weekend closest to St James day. So you might like to look in local newspapers, or on parish notice boards for information.
As there have been accusations that some of the past logs have cheated and not followed the rules, to reiterate:
1: It must be a tower, church, mosque minaret or whatever that is NOT USUALLY OPEN to the public. For example, St Pauls Cathedral in London, or the Empire State Building wouldn't count as anyone can pay to get in, almost any day of the year.
2: An occasional open place is allowed. (A few times in a year for example.)
3: You have to have obtained legal access, no breaking in. In future you'll need to provide a bit of detail of how you got access!
4: A particular tower can be logged more than once, but a particular Geocacher can only score one find against this cache.
Please check out the Geocaching Association of Great Britain offering support for Geocachers in the UK