148 Meaning of “residential property” and “home information pack” 149 Meaning of "on the market" and related expressions  150 Acting as estate agent  151 Responsibility for marketing: general  152 Responsibility of person acting as estate agent 153 Responsibility of the seller  154 Application of sections 155 to 158  155 Duty to have a home information pack  156 Duty to provide copy of home information pack on request 157 Section 156 (1) duty: imposition of conditions  158 Duty to ensure authenticity of documents in other situations  159 Other duties of person acting as estate agent  160 Residential properties not available with vacant possession  161 Power to provide for further exceptions 162 Suspension of duties under sections 155 to 159  163 Contents of home information packs   164 Home condition reports 165 Register of home condition reports   166 Enforcement authorities   167 Power to require production of home information packs  168 Penalty charge notices  169 Offences relating to enforcement officers  170 Right of private action  171 Application of Part to sub-divided buildings  172 Power to require estate agents to belong to a redress scheme  173 Approval of redress schemes  174 Withdrawal of approval of redress schemes  175 Office of Fair Trading 176 Grants  177 Interpretation of Part 5