(a)

the risk is a large risk;

(b)

the risk is covered by a single contract at an overall premium and for the same period by two or more insurance undertakings each for its own part as co-insurer, one of them being the leading insurance undertaking;

(c)

the risk is situated within the Community;

(d)

for the purpose of covering the risk, the leading insurance undertaking is treated as if it were the insurance undertaking covering the whole risk;

(e)

at least one of the co-insurers participates in the contract through a head office or a branch established in a Member State other than that of the leading insurance undertaking;

(f)

the leading insurance undertaking fully assumes the leader’s role in co-insurance practice and in particular determines the terms and conditions of insurance and rating.