Apparently so.

https://www.theguardian.com/business/blog/2014/oct/31/paying-the-price-of-war-britain-makes-good-on-historic-debts

"...there were other bits and pieces of debt lying around. Odd bits and pieces from the 19th century, debt from the Crimean War, from those (not large enough) attempts to deal with the Great Famine in Ireland, bits and pieces relating to the Napoleonic Wars and even, would you believe it, some parts that related all the way back to the South Sea Company and the South Sea Bubble of the 1720s (although that connection is pretty remote)."

https://www.forbes.com/sites/timworstall/2014/12/03/the-uk-government-is-not-about-to-pay-off-all-world-war-one-debt-dont-be-ridiculous/#7424d4f14e16