UK scout groups - like this one from East Wickham and Welling in Kent - have been celebrating with ceremonies held on Wednesday morning. Photo: Gavin Jackman

As the sun rose over the English Channel, members of the 4th Broadstairs group on the East Kent coast became some of the first in the UK to renew their promises. Photo: Ian Williamson

Former scouts led a bagpipe parade for beavers, cubs and scouts from Carnoustie in Scotland. "This has been very exciting day for scouting across the world." Photo: Kenny Lee

"The 1st Biddulph Moor Saracen Cubs and Scouts gathered on the village green to renew their Promise. The boys thought it was great fun!" Photo: Lester Millington, Staffordshire

Scouts from Wokingham District released 100 balloons to celebrate 100 years of scouting at precisely 8am ...

Up, up and away! Photos: Jane Parker

A cross section of the 5th Woodley Scout Group, attending a sunrise event in Berkshire. Photo: Mark Ballard

All across the UK, young and old renewed their scout's promise - here's Paul Dumont aboard the Beryl Alpha oil platform in the North Sea.

Aden and Louise of the 76th Sheffield group, with their scout leaders, in front of Sheffield Town Hall. "Here's to another 100 years of scouting!" Photo: Chris Ackroyd

The 1st South West Cheshires at Crewe Alexandra FC. Photo: Tim Prevett. Send images to: yourpics@bbc.co.uk. For terms and conditions see right hand side.