By Kathryn Rowe and Peter McMaster QC (July 18, 2018, 2:32 PM EDT) -- A recent important U.K. Supreme Court decision now means that institutions in the financial services (and other) sectors whose transactions are conducted through the medium of carefully prepared legal agreements governed by English law can, through the use of suitable standard terms, be confident that those agreements can normally only be varied through properly documented written variations that go through the proper channels. Commercial lenders and others who contract extensively on written contracts are now less exposed to arguments by counterparties that unrecorded conversations have reduced their legal rights as set out in the written agreement....