“In our judgment this decision is authority for the proposition that where a Claimant is guilty of misconduct in relation to proceedings which is so serious that it would be an affront to the court to permit him to continue to prosecute his claim then the claim may be struck out for that reason. In the Arrow Nominees case the misconduct lay in the Petitioner’s persistent and flagrant fraud whose object was to frustrate a fair trial. The question whether it is appropriate to strike out a claim on this ground will depend on the particular circumstances of the case.”