Thank you for the rundown on retirement and pensions etc. While I knew that the pensions I was referring to here were for wounds received, I thought, because of the 1816 law, that pensions were not paid while the officer was in service. The majority of pensions commence several years after the officers suffered their wounds, so I assumed [wrongly] that the pensions weren't being paid while the officer was still receiving pay on service. I would seem that the pension COULD be paid to the officer while they were still serving. I find that odd, but hey, it's Britain in the 1800s. The arbitrary nature of that payment, the who, when and how much, is also odd, particularly before 1816.
Sir John Elley is listed as a colonel with the Horse Guards, wounded at Waterloo as a lt. colonel and receiving a colonel's pension of 300 pounds beginning in 1816. This is from the 1818 returns.