You should ask to see a Home Information Pack whenever you are interested in buying a property. The seller must have commissioned a Pack by the time a property is put on the market.
Your Pack must contain:
The Index should explain the reason why any of the required documents are missing.
The Pack can also include other information that would be of interest to buyers - for example, a Home Condition Report, other searches, and any guarantees and warranties on the property.
Only items that are set out in regulations as either 'Required' (compulsory) or 'Authorised' (optional) may be included in the Pack. The regulations prohibit the inclusion of marketing or advertising material in the Pack, so make sure it includes only official material.
The Pack might also contain a legal summary, and answers to standard enquiries made of sellers.
For more information see What's in a Home Information Pack?