While the property is on the market, there is no need to update the Home Information Pack (ultimately, the market decides whether the documents remain acceptable and up to date).
If the sale of your property stops and then starts again, you would normally be required to assemble a new Pack and to update those documents which are now out of date according to the requirements of the Home Information Pack Regulations. However, the seller can carry on using the same Pack without the need to update any of the documents in the following circumstances: