Hi Nicola
The dates are not exclusive, so you have to consider they may have been stationed in the IOW either side of the date shown:
= 1827 – 21st Regiment of Foot
= 1827 – 87th
= 1830 – 47th
= 1832 – 14th
You also have to consider that he may have been employed by the Barrack Department, and was permanently based in the IOW. And there would have been Royal Artillery batteries there as well.
His record does not appear to have survived in Kew – you can search for surviving records for men discharged before the end of 1854 on the NA catalogue -
http://www.nationalarchives.gov.uk/catalogue/search.asp, using series = WO (for War Office).
If you can get to Kew you could check the Muster Books for these regiments. I have not come across Musters for the Barrack Department, and you will need to narrow down the RA batteries, or face a long search.
http://www.nationalarchives.gov.uk/militaryhistory/army/step4.htm - assuming he was not an officer.
If you know the town on the IOW I would try and find a baptism record for the daughter in case his regiment/corps is mentioned. Ditto with the marriage. If you know of any more children you should post the years and places of birth.
Ken