[2] The building retains fragments of the medieval infirmary hall of the Hospital of St John the Baptist (circa 1170–90).

The work was paid for by the dramatist Dion Boucicault in memory of his son, killed in the Abbots Ripton rail accident of 1876.

[4] Other features of the exterior include a bellcote, five decorative arches on its west front and two bays of the hall's nave and aisles.

[2] Following a temporary exhibition held in Huntingdon in 1958 to mark the anniversary of Cromwell's death, Huntingdonshire County Council developed a collection to celebrate the town's most famous resident and it was decided that the vacant grammar school would be a suitable location for a museum dedicated to Cromwell.

[6] The Museum was completely re-displayed in 1988 and refurbished between November 2003 and late May 2004 when major building work was undertaken and temperature control systems installed.

[1] The majority of public documents relating to Cromwell's public life are held by The National Archives in Kew, but the museum holds a large collection of printed pamphlets and copies of key texts of the period, such as The Humble Petition & Advice of 1657, which clarified the organisation of Parliament and the duties of the office of Lord Protector.