Old Moor Reedbeds - New Years Day

Paid a late afternoon visit to the Old Moor Reedbeds for Bittern and was rewarded with 2 birds. First one flew in at 4.05 and landed in tall reeds to left of Bittern Hide. Second one flew in from Reedbed Hide direction at 4.25 and flew around for about 5 minutes before dropping into reeds to left of Reedbed Hide. This is the first time I have seen a Bittern behave like this, could it be a new bird? Also seen was 1 Water Rail with several more heard, 12 Shoveler from Reedbed Hide and a few Goosanders flying over to roost on the Mere.