More than 4,200 Diamond Jubilee beacons will be lit across the globe in celebration of the Queen's 60-year reign.
The Queen will light the final beacon from the stage at around 10.30pm following the Diamond Jubilee concert where Stevie Wonder, JLS, Sir Elton John and a host of stars will perform in her honour.
More top news
A police officer who sparked a terror alert by making a hoax 999 call to his own force has had his "unduly lenient" jail term increased.
Autumn weather arrives for the early part of the weekend, brighter on Sunday.
The Prince and Princess are being treated to a petting zoo and a puppet show along with the children of local military families.