Saw this on the Royal Mint site today.
"In 2017, The Royal Mint commemorates the 30th year since the Britannia bullion design was first released. Sculptor Philip Nathan, the designer of the first Britannia bullion in 1987, envisaged her as a classic and evolving icon. In this classic design she stands firm against a powerful gale which whips around her shield, Corinthian helmet and olive branch. The 2017 design also features a speckled radial sunburst at her back."
Ken