Airports Act 1996

a person, or 2 or more persons under an arrangement, acquire shares in a company; and

the acquisition has the result, in relation to a particular pair of airport‑operator companies (the first company and the second company), that:

an unacceptable cross‑ownership situation comes into existence in relation to the pair and in relation to a person; or

if an unacceptable cross‑ownership situation already exists in relation to the pair and in relation to a particular person—there is an increase in any type of stake held by the person in either the first company or the second company; and

the person or persons mentioned in paragraph (a) knew, or were reckless as to whether, the acquisition would have that result;