I personally wouldn't file a claim for EC261 because I view this as an unforeseeable event outside BA's control (assuming there was an incident at or near the crew hotel that kept them awake or disturbed their rest) and the action was required to comply with legal rest requirement for crew as well as for crew well being and safety of everyone. My moral compass does not allow me to make a claim on that basis. I don't care how other people view it though.