"(8) The following circumstances take a case out of the norm and justify an order for indemnity costs, particularly when taken in combination with the fact that a claimant has discontinued only at a very late stage in proceedings: (a) where the claimant advances and aggressively pursues serious and wide-ranging allegations of dishonesty or impropriety over an extended period of time; (b) where the claimant advances and aggressively pursues such allegations, despite the lack of any foundation in the documentary evidence for those allegations, and maintains the allegations, without apology, to the bitter end; … (e) where the claimant pursues a claim which is, to put it most charitably, thin and, in some respects, far-fetched; (f) where the claimant pursues a claim which is irreconcilable with the contemporaneous documents …" 5. There have also been cases which have discussed the relationship between bringing an unsuccessful claim for fraud of dishonesty and the award of indemnity costs. These include Clutterbuck v HSBC Plc[2015] EWHC 3233 (Ch) and Natixis SA v Marex Financial and Others[2019] EWHC 3163 (Comm) . In a more recent decision, Bishopsgate Contracting Solutions Limited v O'Sullivan[2021] EWHC 2628 (QB) , Mr Justice Linden said at [16]: "
"An irrational desire for punishment unlinked to the merits of the claims themselves is precisely the sort of conduct which the court is likely to conclude is out of the norm." (iv) where allegations of fraud or dishonesty are made which have failed: see Clutterbuck v HSBC plc[2015] EWHC 3233 (Ch) at paras 16 and 7. In relation to this authority, Mr Forshaw came close to submitting that as a matter of course, if allegations of fraud or dishonesty have failed, costs must be ordered to be assessed on an indemnity basis. Insofar as that was his submission, I do not agree. There is, in my view, no such rule in the context of applications for indemnity costs although, as I have said, where such allegations are made and fail, that may be a reason for making such orders; (v) where an overly aggressive and unreasonable approach to correspondence between solicitors has been adopted: see Excalibur Ventures LLC v Texas Keystone Inc[2013] EWHC 4278 (Comm) at para 48." 6. Earlier in the same judgment, Mr Justice Linden recorded that he accepted that the conduct which forms the basis of an order for assessment on the indemnity basis must involve a sufficiently high level of unreasonableness or inappropriateness to justify an order. He quoted Sir Anthony Colman in National Westminster Bank v Rabobank[2007] EWHC 1742 (Comm) at [28]: "