That's not accurate. I'm referring to the Spanish and Portuguese recruited into the British Army, not those fighting in their own army. And that's one of the reasons I say the 50k number for Vitorio is open to debate, or interpretation. If these guys aren't in the British Army, then they didn't have 50K at Vitorio. (did I get that name right, vitorio, typing quick)
http://www.napoleon-series.org/military/organization/c_spanish.html
"One of the little known episodes of the Peninsular War was the active recruitment of Spanish men into the British Army in 1812 and 1813." <snip> "In 1811, the British Army only recruited 26,000 men to replaced the 21,000 casualties, plus as replacements for ALL of the regiments on active duty, not just those serving in Spain and Portugal. To put it simply, the British Army was running out of men!" <snip>
"Nor could Wellington hope for reinforcements. There were less than 30,000 regular troops left in the British Isles. Many of the battalions were depots for their sister battalions and they were hard press to provide replacements, no less whole units."
Goes on to detail the recruitment particulars. It amounted to a significant percentage of the (admittedly small) British forces, ie, 95th Rifles, "The Spanish recruits for the 1st Battalion comprised 34% of all replacements for the battalion in 1812!" These men were only intended to serve in the Peninsular war, ie...
"One of their conditions of service was that once the war in the Peninsula was over, all Spanish soldiers serving with in British regiments would be discharged and not be required to serve elsewhere. There is some question on whether this occurred in late 1813 when the Allied forces moved into France, or in 1814 after peace was declared and the British Army departed for the British Isles or other locations. Whatever the date, the Spaniards were released and in at least the 95th Rifles, their parting was not a happy one for either side."
He'll get over it.
Edit: I forgot. There's also some question of whether entire Portuguese battalions serving under British command are considered part of the "British Army". The Light Division was half-Portuguese. Again, I'm agreeable to counting them as part of the British Army. Litmus is pretty much whether they were drawing pay directly from the British Army quartermasters.