Hi Mo
Private William Nicholson was given the regimental number 32, when numbers were introduced in the late 1820s. The longest serving men got the lowest numbers. So #32 suggests an early recruit. In the same muster (Qtr 2 1837) when stationed at Templemore and Limerick.
There is a Drummer Francis Nicholson #82. Could he be a younger brother? Or maybe not -
http://discovery.nationalarchives.gov.uk/details/r/C8736162The 1st Battalion 25th Foot fought the French in the West Indies during the Peninsular War. Any man alive in 1847 could claim a Military General Service Medal with clasps for Martinque and Guadalope. You should google both.
I do not have details of the 25th being in Jersey in the late 1790s. But his father may have served there with another regiment. His family could be with him in the West Indies when William became 13 years old, and he was enlisted as a Boy. You will need to look up the 1811 muster for the 25th and see if an older Nicholson is present. Then follow his service back to the late 1790s.
The 25th, like all regiments, moved about a lot. List of stations:
= 1808 to 1817 - West Indies
= to 1827 - Ireland
= to 1834 - West Indies and Guyana
= to 1835 - UK
= to 1837 - Canada
= to 1839 - Ireland
= 1840 - in the Cape
Ken