Parliamentary records of the United Kingdom
Parliamentary records of the United Kingdom covers the period from the creation of the Kingdom of Great Britain in 1707, including records from the Parliament of Great Britain and of the Parliament of the United Kingdom. == Longest Parliament == The longest parliament to continuously sit in any of the United Kingdom’s constituent countries was England’s Cavalier Parliament, which sat for nearly 18 years from 8 May 1661 until 24 January 1679.
Source: Wikipedia — Parliamentary records of the United Kingdom (CC BY-SA 4.0)