Question

why did the British preserve official document
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Answer 1

Answer:

The British believed that by preserving official documents, it would be easier for them or any other persons to know about the decisions taken in the past. One can study the notes and reports that were prepared in the past. Their copies may be prepared and used in present time if needed so

Answer 2

British had preserved official documents, because they thought if they write and record everything, it will later be easier for them to study them and debate. They kept official records of what they thought was right, so that in the future, those records can serve as proofs of all the decisions that they had taken.