The UK's slave trade suppression efforts attempted to remain within the primitive international laws of the time: slavers had to be tried in courts. British vessels were taken to Vice admiralty courts, and those of foreign states which had treaties with the UK were taken to Courts of Mixed Commission. Mixed Commission Courts had representation from both the UK and the other nation in question, to ensure a fair trial. Many were established at key points along the coast of Africa and its islands. However the reluctance of other powers greatly curtailed the ability of the courts to operate; sometimes the foreign representation would never arrive, or arrive exceptionally late. The Brazilian ambassador, in spite of the court opening in 1826, did not arrive until 1828, and he reversed all judgements carried out in his absence upon his arrival.