(5) Where paragraph (4)(c) applies, those requirements of Part 2 of Schedule 1, which are indicated in column (3) of the table in Schedule 4 opposite the description of the refurbishment work, apply in relation to that work.
(6) Paragraph (4) (c) does not apply to refurbishment work which—
(a) only comprises like for like replacement;
(b) is required to be carried out by a contract in writing entered into before 28th April 2014; or
(c) is carried out in-house by the operator pursuant to an arrangement made in writing before 28th April 2014.
(7) Paragraphs (3) and (4) are subject to any exemption order which applies to the rail vehicle.