He was elected as a Member of Parliament for Kinsale in County Cork, Ireland that year, though was defeated as MP for Saltash in Cornwall.
This post was not full-time and allowed Martin to pursue other appointments, and in 1715 (after declining Sir Robert Walpole's offer to be Envoy to Switzerland) he accepted a position in Ireland as Chief Secretary to his old military commander the Earl of Galway and Charles Fitzroy, 2nd Duke of Grafton who held joint Governorship.
In 1719 Bladen, along with Daniel Pulteney, was appointed by the Lord Justices to attend the Court of France[12] to negotiate miscellaneous items outstanding from the Treaty of Utrecht in 1713, such as limits of plantations in America and losses of the Hudson's Bay Company.
[17] Bladen’s influence at the Board of Trade continued to grow through the 1730s and he attended a Conference at Antwerp[18] to negotiate on tariffs.
She was the daughter of Colonel John Gibbs, one time Governor of North Carolina[20] and her mother was Elizabeth Pride, who was a descendant and heiress of George Monck, 1st Duke of Albemarle.
Martin was brother-in-law to Nathaniel Rice, who was Secretary of the Royal Council of North Carolina and Acting Governor on two occasions.
After Mary's death in 1724 Martin married in 1727/8 to Frances Foche/Jory, heiress of Colonel Joseph Jory, Agent for Nevis, and owner of a plantation and several properties.
Frances inherited Aldborough Hatch in Barking in Essex, upon which Bladen built a new house where the couple lived.
In later life, Martin was a Justice of the Peace and was largely responsible for driving highwayman Dick Turpin of the Gregory Gang out of Barking in Essex.
To which is added Aulus Hirtius or Oppius’s Supplement of the Alexandrian, African and Spanish Wars With the Author’s Life.’ He dedicated this work to the Duke of Marlborough.