Can my half Thai, half English daughter travel to England with both passports, and does she need a visa?

The user, an Englishman living in Thailand with a Thai girlfriend and their daughter, inquires about obtaining a passport for his daughter to travel to England. Community responses suggest that she should have both Thai and UK passports for ease of travel. For children under 14, a visa is typically not required for UK passport holders. Guidelines from the British Embassy provide a clear path to obtaining a British passport, and documentation needed includes birth certificates and identification of both parents. It is also noted that she should leave Thailand on her Thai passport, as the British passport will not have an entry stamp upon departure.