Nelson & His World

I've been trying to find, without success, a phrase recollected from a Captain Hardy letter I came across in print some time ago.

In the letter Hardy mentions that he had 'stole three hours at Merton yesterday' or something very similar.

I'd be really grateful if anyone can point out the source, and any additional details for this phrase/letter.

With thanks.

LONDON, Apl 5th [1802],
6 o'clock Eveng.
DEAR MANFIELD,
In about five Minutes I shall break my fast
for the Day. I have been on the Leg ever since 7 o'clock
this morning. I have now done all my business & shall
leave Town in the Portsmouth Mail at 7 this evening. I
was obliged to go to Windsor yesterday to wait on the
Duke I was recd very politely & Dined with Genl Guinn
&c. &c. I stole three hours today to go to Merton where I
saw his Lordship Sir Wm & Lady Hamilton. They are
all extremely well & her Ladyship was quite angry that I
could not stay longer. It is settled with the Duke of Kent
that the Isis is to leave Portsmouth on the 17th Inst for
Falmouth where he is to embark on the 24th if possible.
If anything should call you near Portsth before that time I
shall be happy to see you.
My Dinner is now on the Table & I shall just have
time to swallow it & Drink many happy returns of the
Day to Jos &
Yours Affectionately,
T. M. HARDY.

Nelson's Hardy - His Life, Letters and Friends
A M Broadley & R G Bartelot
p.90
(or The Three Dorset Captains at Trafalgar)

Perfect Tony. You're an absolute fund of knowledge. Many thanks as always.