The foreign travel rules at EIM34010 onwards apply only to employees who are resident and ordinarily resident (see EIM42802). Some deductions are prohibited if the employment is with a foreign employer (see EIM40031) and the employee is not domiciled in the United Kingdom. This requires consideration of:
Unless the employee has completed the non residents pages which
accompany the SA return or the file contains form P86, which
provides information to the contrary, you may accept that an
employee is resident and ordinarily resident in the United Kingdom
for the purposes of the foreign travel rules.
The employer's file may provide information if the employer is resident in a state other than the United Kingdom.