Question: On what bank of Jed Water is the castle near Abbotrule, Scotland, that was restored by Peter Kerr?

Context paragraphs:
Jed Water: The Jed Water is a river and a tributary of the River Teviot in the Borders region of Scotland.

Bairnkine: Bairnkine is a hamlet on the Jed Water in the Scottish Borders area of Scotland, on the A68, south of Jedburgh.

Southdean: Southdean is a hamlet in the Scottish Borders area of Scotland, on the A6088, by the Jed Water and in the Wauchope Forest area.  Other settlements nearby include Abbotrule, Bedrule, Bonchester Bridge, Denholm, Hallrule, Hobkirk and the Swinnie Forest.

Peter Kerr (water polo): Peter Kerr, AM, is an Australian water polo sports official best known for taking the Judge's Oath at the 2000 Summer Olympics in Sydney.  He also was an official for the water polo events at the 1996 Summer Olympics in Atlanta, along with being a referee at the 2000 Games in Sydney.  Kerr served as section manager of the Australian team for the 1988 Summer Olympics in Seoul.

Abbotrule: Abbotrule is a hamlet south of the B6357 road, in the Scottish Borders area of Scotland on the Rule Water.  Places nearby include Bedrule, Hallrule, Spittal-on-Rule, Ruletownhead, Bonchester Bridge, Denholm, Southdean, Hobkirk, Ferniehirst Castle and the Wauchope Forest.

Knight &amp; Kerr: Knight & Kerr was a business partnership established in the 1850s between John George Knight and Peter Kerr.  Their practice was important in the development of Melbourne as a city during the boom period led by the gold rush, providing the rapidly expanding state capital with many works of cultural and political significance.  They were architects appointed with the responsibility for the design of noted public buildings in Melbourne, Australia; their most well known design being the Parliament House of Victoria.  John Knight and Peter Kerr were also both members of The Royal British Institute of Architects.

Bonjedward: Bonjedward is a hamlet in the Scottish Borders area of Scotland, two miles north of Jedburgh where the Jed Water joins the River Teviot.

Hallrule: Hallrule is a hamlet on the B6357 road, in the Scottish Borders area of Scotland, on the Rule Water, near Abbotrule, Bedrule Bonchester Bridge, Denholm, Hobkirk, Ruletownhead and to the south, the Wauchope Forest.

Ferniehirst Castle: Ferniehirst Castle (sometimes spelt Ferniehurst) is an L-shaped construction on the east bank of the Jed Water, about a mile and a half south of Jedburgh, in the Scottish Borders area of Scotland, and in the former county of Roxburghshire.  It is an ancient seat of the Clan Kerr, and after a period of institutional use it was restored for residential use by Peter Kerr, 12th Marquess of Lothian, in the late 20th century.

Inverallochy Castle: Inverallochy Castle is a ruined courtyard castle near the village of Inverallochy in the Buchan area of north-east Scotland.  It lies 0.5 mi south of Cairnbulg Castle near Fraserburgh.  It was described by W. Douglas Simpson as one of the nine castles of the Knuckle, referring to the rocky headland of north-east Aberdeenshire.

Supporting paragraphs: Abbotrule Ferniehirst Castle
Answer: east bank