Hi, Penny. I'm also a descendant of Jane Beaufort, and yes, I do have Richard Fitzalan's ancestry, back to Flaad, father of Alan Fitzflaad, who Was given the castle of Oswaldestre and its adjoining territory by William the Conqueror as a gift. The castle and lands had originally belonged to Meredith, Princess of Powys and daughter of Bleddyn, King of Powys. He attained the Barony of Warrenne through his marriage to the daughter and heir of Warrenne and Sheriff of Shropshire, according to Burke.
As for Elizabeth de Bohun, I have her ancestry back to Humphrey de Bohun, Lord of Taterford, who was living in the early 1000s. He was a contemporary of Malcolm III "Ceann Mor," King of Scotland (who's also in my family).