Question: What was the school in Berkhamsted, Hertfordshire, England that Keith Martin Ball was educated originally called?

Context paragraphs:
Martin Ball: Martin Ball is an English theatre and television actor.  He was born and grew up in Royal Tunbridge Wells in Kent.  He trained at Webber Douglas Academy of Dramatic Art, and graduated in 1992.

John Ball (bishop): John Martin Ball (1934 – 5 September 2016) was a British Anglican bishop.  He was Assistant Bishop of Central Tanganyika in the Anglican Church of Tanzania, and retired to the Church of England.

Keith Martin (heavy person): Keith Martin (1969 or 1970 – December 5, 2014), one of the world heaviest lived people, was famous for being at one point the UK’s heaviest man, weighing approximately 980 lbs at his peak.  Keith Martin was given a gastric bypass operation by the NHS, and had lost over 50% of his body weight.

Berkhamsted Place: Berkhamsted Place was an English country house which was erected sometime around 1580 in Berkhamsted, Hertfordshire, England.  It was built by Sir Edward Carey, the keeper of the Jewels to Queen Elizabeth I from stones removed from Berkhamsted Castle.  Several notable residents of Berkhamsted lived in the house and over the years its owners welcomed guests such as King Charles I and William Gladstone.

Ashlyns School: Ashlyns School is a mixed secondary school and sixth form located in Berkhamsted, Hertfordshire, England.  The school was established in 1935 as the final location of the Foundling Hospital, a children's charity founded in London in 1739.  The Berkhamsted building converted into a school in 1955.

Berkhamsted railway station: Berkhamsted railway station is in the town of Berkhamsted, Hertfordshire, England.  It is located just beside Berkhamsted Castle, overlooking the Grand Junction Canal.  The station is 28 mi north west of London Euston on the West Coast Main Line.  London Midland operates services to London, Northampton and many other destinations.

Keith Martin Ball: Ball was educated at Berkhamsted School and Trinity College, Cambridge where he studied the Cambridge Mathematical Tripos and was awarded a Bachelor of Arts degree in Mathematics in 1982 and a PhD in 1987 for research supervised by Béla Bollobás.

Berkhamsted School: Berkhamsted School is an independent school in Berkhamsted, Hertfordshire, England.  The present school was formed in 1997 by the amalgamation of the original Berkhamsted Grammar School, founded in 1541 by John Incent, Dean of St Paul's Cathedral, Berkhamsted School for Girls, established in 1888, and Berkhamsted Preparatory School.  The new merged school was initially called Berkhamsted Collegiate School, but reverted to Berkhamsted School in 2008.  In 2011 Berkhamsted School merged with Heatherton House School, a girls' preparatory school in Amersham, to form the Berkhamsted Schools Group.  The Group acquired Haresfoot School in Berkhamsted and its on site day nursery in 2012, which became Berkhamsted Pre-Preparatory School for children aged three to seven, and Berkhamsted Day Nursery.

Berkhamsted Castle: Berkhamsted Castle is a Norman motte-and-bailey castle in Berkhamsted, Hertfordshire.  The castle was built to obtain control of a key route between London and the Midlands during the Norman conquest of England in the 11th century.  Robert of Mortain, William the Conqueror's half brother, was probably responsible for managing its construction, after which he became the castle's owner.  The castle was surrounded by protective earthworks and a deer park for hunting.  The castle became a new administrative centre of the former Anglo-Saxon settlement of Berkhamsted.  Subsequent kings granted the castle to their chancellors.  The castle was substantially expanded in the mid-12th century, probably by Thomas Becket.

Berkhamsted F.C.: Berkhamsted Football Club is a football club from Berkhamsted, Hertfordshire, England.  Founded in 2009 after Berkhamsted Town folded, they are currently members of the Spartan South Midlands League Premier Division and play at Broadwater.

Supporting paragraphs: Keith Martin Ball Berkhamsted School
Answer: Berkhamsted Collegiate School