The problem seemed to be air in the hydraulics. OK now after having been bled. Will let you all know if it recurrs. Very relieved it is not 30 hours labour - B&C fixed the problem for free - not sure they would be so generous if it took them 30 hours! Incidentally, reversing camera also went kaput - replaced free by B&C. Alpine said it was due to frost!
Has anyone needed a replacement clutch on a LE Evora yet? I have done 10,000 miles (no track days) and the clutch is beginning to feel decidedly worn - may just need adjustment (ever the optimist). I needed new rear tyres at 8,000 miles, which seems par for the course, so I do not think I am mistreating the car.