Part 3 PATH LENGTH FACTORI1 United Kingdom Column 1: Relationship between PL and MPLColumn 2: Path Length Factor MPL ≤ PL1MPL > PLSmaller of (MPL / PL)0.5 and 4 Annotations Commencement I1 Sch. 3 Pt. 3 in force at 21.10.2020, see reg. 1 Part 3