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Hi Robert,

I agree with most of your answers.

1.  I agree it is a Royal Navy Chronometer.  Having access to the actual passport and a magnifying glass to hand I can read the inscription as DENT Maker to the Queen, 61 Strand and 4 Royal Exchange, London, No 48500.  48500 is a best guess at the indistinct graphic.  A similar DENT chronometer - serial 46982 - was used by the Royal Australian Navy http://collectionsearch.nma.gov.au/object/47896.  Note that the makers name DENT is in a triangle - this might have been their trademark in the late 19th century.  46982 was made in 1895.  This date seems about right for the one in the passport.  The very latest it could be would be 1901- the year that Queen Victoria died. 

3 and 4.  I agree John Harrison and H1 and H4.

5. I can't identify this background drawing.  The official detail is "a drawing of part of the internal working of a clock".

6.  The sextant on the endpage.  We are dealing with very small graphics here.  I don't know the answer.  The illustration could be handy when going through airport security.  "What is in that box sir?"      "A sextant."       "Rubbish - never seen or heard of one"      "Well look at the back page of a British passport!"

7 and 8.  I agree Gypsy Moth IV and Sir Francis Chichester.  If I had been on the design committee I would have chosen Suhaili and Sir Robin Knox-Johnston or perhaps the James Caird and Captain Frank Worsley.  (Perhaps Captain Worsley would not have been selected as he was a 'colonial'!)

9.  I think it is H4.