From the Morning Post 12 Aug 1822 [italics as printed]
On Jack Straw's Castle Hampstead Heath being repaired etc
Come and behold no "Straw built shed"
But the fam'd Castle of Jack Straw
Who raised of yore, his rebel head
'Gainst England's King and England's Law
See! now no man of straw lives here,
But honest Hayter liegeman true,
Who offers good and wholesome cheer,
to Prince or subject, me or you
With best of food, of beer and wines -
Here may you pass a merry day;
So shall "mine host", while Phoebus shines,
Instead of straw, makes good his hay.
ADDED: Apropos Monica's find of the summons for serving booze on a Sunday I found this, showing reason prevailed, in the Morning Chronicle 29 Mar 1833
Wednesday at Marylebone, Mr J Hayter landlord of Jack Straw's Castle on Hampstead Heath was summoned by Johnson for serving liquors during divine service. Mr Rawlinson said he was decidedly of opinion that the poor artizans and others who rambled out to that healthy spot, Hampstead heath, on a Sunday, ought not to be prevented from enjoying themselves in a reasonable manner; and if they overstepped reason, then there was a law to punish them. The only footing he could put it on, was to consider persons walking on Hampstead Heath travellers; and the information was, therefore, dismissed.