I also found this: link:
http://www.british-history.ac.uk/report.aspx?compid=119463I believe this was to be part of the Cloister.
"In N. walk—on N. wall, (9) to William Fox, 1680, and James Fox, 1677, black and white marble tablet with eared architrave, cornice, cherub-heads and two shields-of-arms; (10) to William Laurence, 1621, plain marble tablet; (11) to Humphrey Langford, M.P., 1685, grey marble tablet with self, apron and shield-of-arms; (12) to John Coleman, 1709, plain white marble tablet; (13) to Richard Gouland, 1659, black marble tablet with eared stone architrave, drapery and skull; (14) to Francis Newman, 1649, plain white marble tablet; (15) to Ann (Bush), wife of William Gawen, 1659, five children and
Isaac Bush and Frances, his wife, parents of Ann Gawen white marble tablet with cornice, apron and lozenge-of-arms; (16) to Richard, 1672–3, Christopher, 1675, and Peter, 1672, sons of Christopher Chapman, plain tablet; (17) to Christopher Chapman, 1681, Melior, his wife, 1707, and Elizabeth, their daughter, 1680–1, white marble tablet with architrave, round head, apron and cartouche-of-arms."
Then:
' Wife, first, of Gabriel Birkhead (see his burial 23 Dec. 1614), to whom married at St.
Margaret's, Westminster, 1 May 1604, as Frances Fann [? Fane], and, secondly, of Isaac Bush (see
his burial 30 Dec. 1641), to whom married before 21 May 1623, when Camden (the antiquary) left
her £2 in his will, a8 the widow of Birkhead and wife of Bush
From Full text of "The marriage, baptismal, and burial registers of the collegiate church or abbey of St. Peter, Westminster" Link
http://www.archive.org/stream/marriagebaptism02chesgoog/marriagebaptism02chesgoog_djvu.txt1641 Dec. 80 Isaac Bush :* IClmt&rs],
^ In the record of administration to his estate, in the Court of the Dean and Chapter, Feb.
1641-2, he is called '* Isaac Bush alius Dolwen." He was one of the messengers of the Exchequer
temp, Jas. I. See his wif e*8 burial 9 Sep. preceding. Their only dau., Anne, was wife of William
Gawen, of Westminster, and it is stated on a monument in the Cloisters that ^e died 26 Nov.
1659, and was there buried with five of her children ; but no record exists in the Register of anj
of them, except a dau. Margaret (see her burial 14 Apl. 1650), and perhaps a son Edward (see a
burial 30 June 1643). The will of her husband, William Gawen, then of Harpenden, Herts,
Gent., dated 24 Julj 1699, was proved 11 Aug. 1702.