The following response has (finally) come from Fife Council..
If your bin has not been collected since before Christmas: Your can use your brown bin to store household waste and can present these bins on the next scheduled brown bin collection day and they will be emptied. Therefore the brown bin waste will not be recycled from this uplift as it will be going to landfill. This is only for households where grey bins have not been emptied since before Christmas.
However the crews are still trying to catch up with missed bins where access allows so please leave your bins out at the kerbside.