The User clause refers to the Permitted Use as stated within a lease outlining the use to which the tenant can put the premises as opposed to the Legals Use as defined  by the formal classification of “Uses” are set out in the Town and Country Planning (Use Classes) Order 1987 as amended, which is a statutory measure defining various Use Classes.  The definition  of the user clause within a lease is important in determining whether the Use specified is restricting or open.   This aspect is important when establishing an open market rental value of a property.  In some instances for example a lease may dictate the rent to be reviewed to the higher of B1 (office) or D1 (Education) at the time of the review and when the Permitted Use is D1 Education and / or B1 Office.