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Box 15 of self employment pages (full) covers any other business income not included in Box 14 as turnover.
It includes rental income from letting part of your business accommodation that has
become temporarily surplus.
I would not show it as rental income on property income pages - SA105 unless you can convince HMRC that it is rental income in the true sense and not connected to your business income.
More information on this can be found on SA103f-notes here
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