Site owners mustiiMobile Homes Act 1983, Schedule 1, Part 1, para 25:
if requested by the occupier, provide (free of charge) a copy of the current public liability insurance certificate and documentary evidence in support, and explanation of, any new pitch fee, or any other charges payable to the site owner under the terms of the agreement
repair, and where necessary, replace the base on which the mobile home is stationed and maintain any gas, electricity, water, sewerage or other services supplied by the site owner to the pitch or to the mobile home
maintain all parts of the site, which are not the responsibility of any of the occupiers
consult the mobile home occupier about improvements to the site in general, and in particular about those improvements which the owner wishes to be taken into account...