EIM32075 | Travel expenses: travel for necessary attendance: definitions: temporary workplace
From HM Revenue & Customs · Employment Income Manual
Section 339(3) ITEPA 2003
A workplace is a temporary workplace if an employee goes there only to perform a task of limited duration or for a temporary purpose. So even where an employee attends a workplace regularly, it will be a temporary workplace and so not a permanent workplace, if the employee attends for the purpose of performing a task of limited duration or other temporary purpose.
Limited duration is explained at EIM32080.
Temporary purpose is explained at EIM32150.
If a workplace is capable of being a temporary workplace by reference to this rule, you must consider the following additional rules:
These rules can only apply if the workplace is capable of being a temporary workplace by reference to S339(3).