ID for a Fern please


Hi All, could someone help me to identify this fern, i think it might be a Royal Fern (Osmunda regalis) but not sure.
It has been located in full sun before being moved to a shady spot under the pergola. It does produce white pale flowers early in the year and loses it's leaves in the winter.
Any help greatly appreciated, thanks in advance.
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It does match exactly the suggestion made by Asarum though, please see the attached pic.
Need to find out what care it needs now ?.
Thanks to both of you.