It’s not hard to find:
Here from the Daily Mail report on the original criminal trial:
In March, 2004, after false documents had been obtained claiming the girl was their daughter, a successful request was made to the British High Commission in Ghana for UK entry clearance for the "family". Three months later they flew to London.
Here from the records of the disciplinary hearing:
https://www.dailymail.co.uk/news/article-566852/Couple-smuggled-13-year-old-girl-Britain-work-household-slave.html
https://assets.publishing.service.gov.uk/media/66e2e938718edd8177131679/TRATMPO_Ernestina_Quainoo_conduct_panel_outcome__002_.pdf