A British woman has described feeling "unwelcome in my own country" after airline staff refused to let her board a flight with her two young children due to new dual nationality regulations.Colette Bjorn-Alderson, 33, had been travelling to attend her best friend's wedding in Wales when she was stopped at Copenhagen Airport's check-in desk.The mother was left stranded with her six-week-old baby Rowan and 23-month-old son Fearn after staff inform…