Commencement Information
I1Sch. 6 in force at 31.12.2010, see reg. 41(5)
The frequency of the periodic checks shall be as follows—
(a)linguistic knowledge (only for non-native speakers): every three years or after any absence of more than one year,
(b)infrastructure knowledge (including route and operation rules knowledge): every three years or after any absence of more than one year on the relevant route,
(c)knowledge of rolling stock: every three years.