The Ellerby Hoard has featured in the news recently due to the recent (October 7th) Spink auction in London where the coins reached a “hammer price” of £628,000 for all the lots, with the final purchase price including fees calculated at £754,000. The hoard was found in 2019 when a couple renovating their 18th-century property in the village of Ellerby, near Hull, made the discovery of a lifetime beneath the kitchen floor. Buried inside a small cup were over 260 gold coins from the 17th and 18th centuries, dating from the reigns of King James I through to King George I. This article provides some interesting insights based on an analysis of the coin weights.
BNS Research Blog 
An excellent and well researched article. Adds much to the knowledge of the Guinea and present rarity.
Most grateful.
Thank you for your kind words