The standard pension for a Lieutenant disabled from wounds appears to have been GBP 70 per year (with higher amounts allowed for losses of eyes and limbs), so that might have been the same amount given as a one-time gratuity as well. That figure comes from an interesting book available as a reprint from Naval and Military Press that gives the details of all officers pensioned as a result of wounds suffered during the Napoleonic Wars: "Return of the Names of the Officers in the Army . . . " (1818).