While most of the entries in this index are for London there are a fair number of entries relating to people from Hertfordshire as the following example shows.
Extracts relating to Seabrook - a local Hertfordshire surname
Atkins, William, and Katherine Seebrooke, widow of St Albans, Herts, gen. Lic., 2 Sept. 1578. B
Fencott, Ralph(Phencott), and Rose Seabrooke, of city of Westminster, widow, 27 Feb 1635/6. D
Godnam, Roger, yeoman, and Margaret Sebrooke, widow, now of the City of London, relict of Robert Sebrooke, late of Cheddington, co. Bucks, yeoman, gen. Lic., 5 Feb 1589/90. B. [Cheddington adjoins the rural part of Tring, Herts, parish where the name Seabrook was comparatively common - see example in Right Name, Wrong Body. The hamlet of Seabrook is not far from Cheddington.]
Seabrooke, Gilbert, clerk, and Elizabeth Silverlocke, spinster, daughter of Richard Sliverlocke, of Chipping Barnett, Herts --- at Chipping Barnett aforesaid. 6 Nov. 1622. B.
Seabroke, John, of Norton, co. Herts, yeoman, and Elizabeth Pollerd, of same, widow of John Pollerd, late of the same, yeoman --- at St Sepulchre, London. 26th Jan. 1602/3. B.
Seabroke, Robert, of Watford, co. Herts, mealman, and Margaret Bonnings, of the same, spinster, daughter of --- Bonnings, deceased --- at Watford aforesaid. 2 Oct 1611. B
Seabroke, Thomas(Seybroke), and Margaret Wagen, of St Albans, Herts, widow, gen. Lic., 24 April, 1563. B.
Seabroke, Thomas, yeoman, and Joane Samon, spinster, now of the City of London, daughter of Thomas Samon, late of Horden, co. Herts, yeoman, deceased --- at St. Andrew Hubbard, London. 11 Nov. 1590. B.
Seabrooke, Thomas, of the city of Westminster, bricklayer, and Elizabeth Goulder, widow of Richard Goulder --- at St Gregory, London. 19 Sept. 1626. B.
Wittewronge, John, of Stanton, Bucks, esq., widower, about 30, and Mrs Martha Seabrooke, of Mark Lane, London, spinster, about 19, her mother's consent --- At All Hallows Barking, 29 Oct. 1670. V. [? Was he a relative of the Wittewronge of the manor of Rothhamsted, Harpenden, Herts.]
Michael Miller (millerfairfield @t aol.com) writes: You queried whether John Wittewrong, married to Martha Seabrooke at Barking in 1670, was related to John Wittewrong of Rothamsted. According to Burke, "Extinct Baronetcies", London 1844, the answer is that he was the eldest son and heir of Sir John Wittewrong (Sheriff of Herts 1658, created Baronet 1662, who died at Rothamsted aged 75 in June 1693) by his first marriage to Mary, daughter of Sir Thomas Middleton of Chirke Castle, Denbigh. Sir Thomas Middleton had been commander of the Parliamentary forces in North Wales, and had raised the siege of Oswestry: try google for more details.
Burke gives a fairly full account of the Wittewrong family, back to the birth of Jacques at Ghent in 1531, and lists the second Baronet's five children by Martha Seabrook. The eldest son, another John, succeeded his father as third Baronet in about 1703 and was MP successively for Aylesbury and Chipping Wycombe, and a colonel in the army. If you don't have access to Burke I can copy more details for you.
In case you are interested, I am descended from James Wittewrong, a son of the first Baronet by his second marriage, who was Treasurer of Lincoln's Inn in 1697, and succeeded Anthony Faringdon as Recorder of St Albans 1st March 1698/9 . The Inn displays his arms in the Chapel (Argent, three bends gules, on a chief sable a bar indented or)
B. Bishop of London's Office
D. Dean and Chapter of Westminster
F. Faculty Office of Archbishop of Canterbury
V. Registry of the Vicar-General of Canterbury