A recent discussion may be found here:

Michael G. Brennan and Noel J. Kinnamon, "Robert Sidney, ‘Mr Johnson’, and the Education of William Sidney at Penshurst," Notes and Queries 50 (2003): 430-37.

Michael Brennan also has some discussion of Jonson in The Sidneys of Penshurst.

(And if this isn't what you had in mind Germaine, and you do come across something more recent, please let me know as I would want to update the footnote from which I took this!)

Lisa
********************************
Dr. Lisa Celovsky
Associate Professor
Dept of English
Suffolk University
41 Temple St
Boston, MA 02114-4280

---- Original message ----

Date: Sat, 23 Aug 2008 12:00:55 -0400
From: Germaine Warkentin <[log in to unmask]>
Subject: Ben Jonson at Penshurst
To: [log in to unmask]
>I think there is a fairly recent article demonstrating fairly
>conclusively that Ben Jonson did indeed function as tutor at Penshurst
>ca. 1610-12. Can anyone direct me to it? I know there has been
>speculation about Jon's supposed life at penshurst for a long time, but
>my recollection is that this article was able to prove the case. And if
>I am wrong, I know the learned members of the list will correct me!
>Thanks, Germaine
>
>--
>***********************************************************************
>Germaine Warkentin // English (Emeritus)
>VC 205, Victoria College (University of Toronto),
>73 Queen's Park Crescent East, Toronto, Ont. M5S 1K7, CANADA
>[log in to unmask]
>
>“The primary rule of intellectual life: when puzzled,
>it never hurts to read the primary documents” (Stephen Jay Gould)
>***********************************************************************