“17. It is well settled by the authorities that the court should exercise caution in granting summary judgment in certain kinds of case. The classic instance is where there are conflicts of fact on relevant issues, which have to be resolved before a judgment can be given (see Civil Procedure Vol 1 24.2.5). A mini-trial on the facts conducted underCPR Part 24 without having gone through normal pre-trial procedures must be avoided, as it runs a real risk of producing summary injustice. 18. In my judgment, the court should also hesitate about making a final decision without a trial where, even though there is no obvious conflict of fact at the time of the application, reasonable grounds exist for believing that a fuller investigation into the facts of the case would add to or alter the evidence available to a trial judge and so affect the outcome of the case.”