The Lowndes Roll is now online for your perusal at
http://www.mikelowndes.net/lowndes-roll/
Archive number D\LO\5\12 . The Pedigree was comissioned/created by a member of the Selby-Lowndes family in 1862 and bought by the Archive in 1957. The Lowndes archive is catalogued in the National Archives, here
http://www.nationalarchives.gov.uk/a2a/records.aspx?cat=008-lowndes&cid=5-8#5-8
You will quickly see that it is far from finished. Though the main lines are present, many details are noted in pencil and some colouring remains incomplete.
The Pedigree and other things in the Ayelsbury archive relate to the Chesham branch of the family who arrived c.16th. It also concerns the Winslow branch of the family, and subsequently Lowndes-Stone of Brightwell Park, Oxfordshire. There’s plenty more in the archive I may return to, including a collection of C18th recipies, and documents recording the building of the Lowndes estate in Knightsbridge, London – by Thomas Cubitt (1788-1855), when this was a ‘green field’ area.
A related pedigree:
http://www.nationalarchives.gov.uk/a2a/records.aspx?cat=008-dx501600&cid=71#71
Another pedigree:
http://seax.essexcc.gov.uk/result_details.asp?DocID=908500
Lowndes family history 