Posted: 05/02/2015 at 12:45
More of these are killed by protecting than frost!
The crown needs to be kept damp at all times as that is the growing point. So saying that you protected it - has it been kept dry for months?
To check if it has life then feel the crown - you should feel the knuckles of new growth.
Remove all 'protection' unless temperatures are forecast below -4C.
The fronds (they are not leaves) are hardy to -3C and the crown less than that but protecting the crown with overhead cover/fleece during the worst of the weather will help.