of several counties (including Hampshire (1502), Middlesex (1505) and Buckinghamshire (1507)), was Commissioner for Subsidies for Middlesex and Buckinghamshire in 1503, was Steward to the lands of Edward Stafford, 3rd Duke of Buckingham in Hampshire in 1504, and held various other commissions in those counties and in London and Essex. He was a feoffee for Henry VII in a 1504 land transaction concerning Syon Abbey, where his sister Margaret led a religious life. He also acted as feoffee for his brother-in-law Edmund Dudley, Speaker of the House of Commons, who had married his sister Anne. When his stepfather died in 1505, making Dame Elizabeth his executor and Andrew Wyndsore and Edmund Dudley his supervisors, Andrew was appointed Keeper of the Wardrobe in his place, opening great opportunities for enrichment. In handling the King's finances Dudley amassed wealth and estates, and became a foremost mediator of royal favour and influence. Edmund Dudley and Richard Empson were immediately imprisoned on the death of the King in 1509, but Wyndsore was among those to be invested Knight of the Bath at the Coronation of King Henry VIII. During their indictment and conviction for Constructive treason Dudley and Empson were held in the Tower of London, where Dudley declared a will making Bishop FitzJames, Sir Andrew Wyndsore, Dean Colet and Dr Yonge his executors or feoffees. Wyndsore was thereby joined in Dudley's attempt to resist the predatory intentions towards his estates of John Ernley, who as Attorney General for England and Wales was deeply embedded in the new king's favour. Following Dudley's execution in 1510, in which year Wyndsore sat as Member of Parliament for Cricklade, these matters came into court in 1512. Knight service Wyndsore played a significant part in Henry's military expedition to France in 1513. He arrived at Calais on 30 June in the King's own party, together with Viscount Lisle, Lord Willoughby and others, as Treasurer of the King's middle-ward. He was present at the Siege of Thérouanne and at the Battle of the Spurs, after which he was among the first to be advanced as Knights Bannerets. The King's army afterwards set down before Tournay, which they also took. It was then as a Knight Banneret with 20 horse that in 1514 he attended Mary, the King's sister, in her journey to France for her marriage to Louis XII. In England he resumed his stewardships for the Duke of