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A423 between A445 and A45, Warwickshire (Grid ref SP371751) A423 between A445 and A45, Warwickshire (Grid ref SP380739) A423 between B4453 and A445, Warwickshire (Grid ref SP400710) A423 between A426 and B4453 Leamington Rd, Warwickshire (Grid ref SP416649) A423 between A425W and A425E, Warwickshire (Grid ref SP420614) A423 between A425 and A426, Warwickshire (Grid ref SP420626) A423 between Warwickshire boundary and A425, Warwickshire (Grid ref SP436520) A423 between A422 and Oxfordshire boundary, Oxfordshire (Grid ref SP449460) A423 between A34(T) and Abingdon Rd, Oxfordshire (Grid ref SP514035) A423 between A34(T) and Abingdon Rd, Oxfordshire (Grid ref SP516035) A423 between Abingdon Rd and A4144, Oxfordshire (Grid ref SP519035) A423 between A4142 / A4074 Heyford hill and A4144, Oxfordshire (Grid ref SP527030)