The birthday of the Princess Royal is an official flag flying day only in Scotland, not in the rest of the UK.
North Riding Day takes place annually on 22 August.
It marks the date of the battle of the Standard (1138), when English forces defeated the Scots near Northallerton.
The name of the battle derives from the consecrated banners of the minsters of Durham, York, Beverley and Ripon.
These flew from a mast mounted on a cart that marked the centre of the English position.
East Riding Day takes place annually on 24 August.
It marks the birthday of Hull-born MP William Wilberforce (1759–1833), leader of the movement to abolish the slave trade.
Turks and Caicos celebrate Constitution Day annually on 30 August.
The date honours the first constitution of the islands, adopted on 30 August 1976.
Northumbria Day takes place annually on 31 August, the feast of St Aidan.
Aidan of Lindisfarne (d. 651) was a monk and missionary.
He founded Lindisfarne Priory and by tradition converted the Northumbrians to Christianity.
Gibraltar celebrates its National Day – first held in 1992 – annually on 10 September.
The date marks Gibraltar’s first sovereignty referendum (1967), when voters chose to stay under UK sovereignty rather than transfer to Spanish sovereignty.
Rutland Day takes place annually on 13 September.
It marks the defeat of the ‘Grand Assault’ during the siege of Gibraltar in 1782.
Among the defenders were the men of the 58th (Rutlandshire) Regiment of Foot.
Derbyshire Day takes place annually on 22 September.
BBC Radio Derby presenter Andy Whittaker organised a vote, and the chosen date commemorates the first raising of the flag.
Alternative suggestions included: 28 July – Derby, the county town, granted city status; 12 May – the birthday of Florence Nightingale, who spent her early years in the county.
Cumberland Day takes place each year on 24 September.
It marks the anniversary of the baptism of renowned local character John Peel (1776-1854).