The Royal Arch is the completion of Pure and Ancient Freemasonry. Every Lodge has a representative who can inform members about the Order, and encourage members to complete their Masonic journey by joining. Membership is open to all Freemasons who have been Master Masons for at least four weeks.
The Royal Arch meets in Chapters rather than Lodges, and Chapters in Herefordshire join together with those in Gloucestershire in the Province of Gloucestershire and Herefordshire, and you can find out a lot more on their website.
Royal Arch Masonry is governed in England and Wales by the Supreme Grand Chapter, and there is more about the Order on their website here