Bluebulb Projects' The Measure of Things presents:
4,500 is about seven times the number of Members of Parliament (The U.K.).
In other words, it's 6.90 times the count of Members of Parliament (The U.K.), and the count of Members of Parliament (The U.K.) is 0.140 times that amount.
(a.k.a. MPs) (2016 figures) (formally "Members of the House of Commons of the Parliament of the United Kingdom of Great Britain and Northern Ireland")