The people who decide aboyt resist will be your department. They have told you no. They may have an appeals procedure, but I wouldnt waste the time, becayse they are not going to alter exams becayse you have failed and booked a holiday. Chec the terms of your insurance to see if you ahve any cancelation cover which applies. I would have thought youd be more bothered by your degree, the thing thats costing you £50k.