I was going to link to the article in DailyMail Online about this, but for whatever reason it's not working.
So, to reiterate, Rochester Cathedral is the second oldest in England (first called Saint Andrews and built about 604) and that is where the manuscript is kept. It is in old English. Called Textus Roffensis, it predates the 1215 Magna Carta and was a compilation of laws that go back before the Norman Conquest. Monks at the Saint Andrew's Priory at Rochester Cathedral likely created this illuminated manuscript. One of the reasons the monks may have created it is that at the time England was not unified and, for instance, there was a King who ruled Kent. So, I see that if one were traveling from one Kingdom to another, one might want to know the various rules and regulations for each before hand.)
A little research on this cathedral and it is and has all along been a parish in which services are conducted. Because of its historical nature, there are also exhibits...
https://www.rochestercathedral.org/exhibitions
1400 years of prayer!
