50.—(1) A contracting entity must allow a period of at least the relevant standstill period to elapse between the date of despatch of the notice referred to in regulation 49(1) (notice of a decision to award a concession contract) and the date on which that contracting entity enters into the concession contract.
(2) Paragraph (1) does not apply if—
(a)the concession contract is exempt from the requirement for prior publication of a concession notice;
(b)there are no tenderers concerned or candidates concerned;
(c)a notice is not required to be given under regulation 49(1) (notice of a decision to award a concession contract).
(3) If notice is sent to all economic operators by facsimile or electronic means, the standstill period is a period of 10 days ending at midnight at the end of the 10th day after that on which the last notice is sent.
(4) If notice is sent to any economic operators only by other means, the standstill period is a period of 15 days ending at midnight at the end of the 15th day after that on which the last notice is sent.