Martin White has had an article published recently concerning the Mazarine Blue, and its last known site in England at Epworth, Lincolnshire.

The article explores the most likely ecological reasons for the extinction of the Mazarine Blue in Great Britain using, as its principal model, the butterfly's last known breeding colony in England, in Epworth, Lincolnshire. It is strongly hoped that the information will be useful in either justifying more research into the Mazarine Blue's precise needs, or possibly show the way forward for the successful re-establishment of this species. 

Here is the link to the article:  http://www.dispar.org/reference.php?id=112