Misc: What part of Britain is St. David the patron saint of?

Questions

The mathematical notation for a summation is designated by what greek letter?

The minimum number of members required to be legal is known as a?

The moose?

The most famous church in Great Britain, enshrining many of the traditions of the British people?

The most prominent of the 12 disciples of Jesus Christ, a leader and missionary in the early church, and traditionally the first bishop of Rome?