Leech came from a cadet branch of a Cheshire family seated at Lower Carden in the reign of Edward III.
In the following decade Leech became involved in the most delicate of Pembroke’s family affairs, including visiting the earl’s mother-in-law, the countess of Shrewsbury, in the Tower, and becoming the financial adviser and personal friend of Pembroke’s cousin, Sir Robert Sidney*.
Leech’s interest in the north Midlands dated from the death of Gilbert Talbot†, 7th earl of Shrewsbury in 1616, when Pembroke succeeded to most of his estate and influence, enabling his servant to lease ecclesiastical property in Derbyshire.
During the recess Leech was knighted and admitted as one of the masters in Chancery, a post he retained for the rest of his life. At around this time he also left Pembroke’s formal employment, being succeeded as secretary by John Thorowgood*, although he continued to handle some aspects of the earl’s business, for example negotiating with Sir Thomas Wentworth concerning the Talbot inheritance.
During the summer of 1624 Leech reportedly made an unsuccessful bid of £7,000 for the mastership of the Wards.
Leech lost his first wife shortly before the 1626 general election, and may have stood down in Thorowgood’s favour. However, in 1628 he returned to the fray, and was returned as senior knight of the shire for Derbyshire, a remarkable honour for a newcomer and a part-time resident with only a moderate estate. He probably owed his election to Pembroke, who may have recommended him to his political ally the 2nd earl of Devonshire (Sir William Cavendish I*).
Pembroke’s death in 1630 left Leech without a patron but he proved well able to defend his Derbyshire estate.
