“It is clear on authority that an applicant for an anti-suit or anti-enforcement injunction should apply ‘promptly and before the foreign proceedings are too far advanced’ However Mr Coleman, for Ecobank, submits that delay does not include any period during which the applicant sought to challenge the jurisdiction of a foreign court and the period pending the foreign court's decision on that challenge. I cannot accept that proposition. Leggatt LJ in The Angelic Grace … described graphically the ‘reverse of comity’ were the English court ‘to adopt the attitude that if a foreign court declines jurisdiction, that would meet with the approval of the English court, whereas if the foreign court assumed jurisdiction, the English court would then consider whether at that stage to intervene by injunction’. As Christopher Clarke J said in [the Transfield case] ‘… comity, which involves respect for the operation of different legal systems, calls for challenges … to be made promptly in whatever is the appropriate court’. Advent Capital PLC …cited by Mr Coleman in support of his submission, was a decision on its facts and is not authority for a principle in the form of Mr Coleman's proposition. It is of note that Morison J [in that case] included a quotation of Leggatt LJ's reference to the ‘reverse of comity’.”
“(1) There is no rule as to what will constitute excessive delay in absolute terms. The court will need to assess all the facts of the particular case, see Essar Shipping v. Bank of China. (2) The question of delay and the question of comity are linked. The touchstone is likely to be the extent to which delay in applying for anti-suit relief has materially increased the perceived interference with the process of the foreign court or led to a waste of its time or resources - see Ecobank Transnational v Tanoh …” (3) When considering whether there has been unacceptable delay a relevant consideration is the time at which the applicant's legal rights had become sufficiently clear to justify applying for anti-suit relief - see, for example, Sana Sabbagh v Khoury [2018 EWHC 1330 …”