The proposal is the work of Brady Ells. It incorporates the earlier golden sun on maroon flag for the Lothian region as a whole devised by Philip Tibbetts
– see the post on Midlothian for a fuller background into the Lothian flag.
The Patron Saint of Linlithgow, the county town, is Saint Michael who features on its coat of arms as seen in this illustration from The Book of Public Arms by A.C. Fox-Davies 1894
Brady’s proposal therefore combines the angelic wings of Saint Michael with the Lothian sun. In combination these also convey the theme of a halo as appears on the arms.