Mae Atodlen 1 i Ddeddf Marchnad Fewnol y Deyrnas Unedig 2020 (UKIMA) yn darparu na fydd yr egwyddorion cydnabod cydfuddiannol a diffyg gwahaniaethu o dan Ran 1 o UKIMA yn effeithio ar gymhwyso cyfyngiadau a gofynion deddfwriaethol penodol. Mae adran 10 o UKIMA yn darparu y caiff yr Ysgrifennydd Gwladol ddiwygio Atodlen 1 drwy offeryn statudol (OS). Er enghraifft, gweithredu cytundeb sy'n rhan o gytundeb Fframwaith Cyffredin ac sy'n darparu y dylid eithrio achosion, materion, gofynion neu ddarpariaeth benodol o gymhwyso egwyddorion mynediad i'r farchnad.
Schedule 1 to the United Kingdom Internal Market Act 2020 (UKIMA) provides that the mutual recognition and non-discrimination principles under Part 1 of UKIMA will not affect the application of certain legislative restrictions and requirements. Section 10 of UKIMA provides that the Secretary of State may amend Schedule 1 by statutory instrument (SI). For example, to give effect to an agreement that forms part of a Common Framework agreement and provides that certain cases, matters, requirements or provision should be excluded from the application of the market access principles.