I chose the Norman Conquest as this is where the numbering system begins, but a version with the prior kings would be interesting and definitely more difficult. Perhaps time to create a new quiz.
The title and description don't match. The title mentions British Monarchs, but the description says Monarchs of England. This is a list of just English monarchs up to the accession of James VI of Scotland to the English throne.
Lots of omitted exceptions. Ed IV and Henry VI both reigned twice, Lady Jane Grey, Matilda, both left out. What about Louis in 1216-17? Mary II died in 1694. And of course 'England' had kings before 1066.