Burgh was returned to parliament for
County Carlow in 1818, a seat he held until 1826, and then represented
Queenborough between 1826 and 1830. He held office under
Lord Liverpool as
Surveyor-General of the Ordnance between 1820 and 1827. In 1826 he succeeded his second cousin
William Downes, 1st Baron Downes, who had no children, as second Baron Downes according to a special remainder in the
letters patent. As this was an
Irish peerage it did not entitle him to an automatic seat in the
House of Lords and he was able to remain a member of the
House of Commons. However, in 1833 he was elected an
Irish representative peer and entered the House of Lords. In 1860 he was appointed a Knight Grand Cross of the
Order of the Bath. On the retirement of the Duke of Wellington from political life, Lord Downes also retired and occupied himself with the life of a country gentleman. He became in due course major-general on 10 January 1837, lieutenant-general on 9 November 1846, colonel of the 54th foot 1845–50, ==Family==