As an adult worker, you are entitled to a rest break where your daily working time is more than 6 hours.
Details of this rest break, including the duration, can be regulated by a collective or workforce agreement.
If there is no such agreement, the rest break will be for an uninterrupted period of not less than 20 minutes and you will be entitled to spend that break away from your work station.
BIS guidelines state that the break should be taken during the 6 hour period, (not at the beginning or end of it), but otherwise at a time to be determined by the employer.
The Regulations covering daily rest breaks do not apply where a worker's working time is unmeasured.
Mobile workers in road and rail transport have different rules. They must be given 'adequate' rest. Also, HGV and PSV road transport drivers have better entitlements through the Road Transport (Working Time) Regulations and the Tachograph Regulations that govern driving hours.