"Such evidence should identify the medical attendant and give details of his familiarity with the party's medical condition (detailing all recent consultations), should identify with particularity what the patient's medical condition is and the features of that condition which (in the medical attendant's opinion) prevent participation in the trial process, should provide a reasoned prognosis and should give the court some confidence that what is being expressed is an independent opinion after a proper examination. It is being tendered as expert evidence. The court can then consider what weight to attach to that opinion, and what arrangements might be made (short of an adjournment) to accommodate a party's difficulties. No judge is bound to accept expert evidence: even a proper medical report falls to be considered simply as part of the material as a whole (including the previous conduct of the case). The letter on which the Appellant relies is wholly inadequate."