Quote " Damien I don't think manufacturer's warranty comes into play as your contract is with the dealer"
You are wrong in your thoughts over fitted equipment.
The only part of a caravan covered by the manufacturers warranty (ie Bailey, Swift etc) is the fabric of the van, the water ingress guarantee and things like floor delamination.
Evry bit of kit bought in as fitments, such as the cooker, fridge, air con, blinds, windows, doors, water heaters etc are only covered by the individual maers guarantee, which for fridges, cooker and water heaters is 3 years from date of purchase.
Windows and plastics generally have a 1 year warranty, other items have their own lengths of guarantee, or warranty.
Items such as fridges , cookers , water heaters are not part of the build as such, they can be fitted or not and do not need to be fitted for the van still to be used, unlike the roof or floor.
Here is the info from , in this case Bailey, but is pretty much universal to all UK makers:
3 Year Manufacturer’s Warranty
For a period of twenty-four (24) months from the initial date of purchase Bailey of Bristol offer a comprehensive warranty on all parts and components as well as full coverage for any manufacturing faults forming part of the original specification of the vehicle. The manufacturer’s warranty then extends to an additional twelve (12) months on the following items.
Chassis: all chassis members including corner steadies
Suspension: axle suspension and braking system (excluding any damage to or faults in brake drums and shoes that are caused through misuse of the braking system or from normal wear and tear)
Running Gear: road wheels (excluding tyres)
Towing Mechanism: all mechanical components fitted to vehicle (excluding electrics)
Cooker: the cooker unit including burners, grill, oven, flame failure device and igniter
Refrigerator: door seal condenser, gas control valve, gas igniter, flame failure device, 12 and 230v heater elements, gas thermostat, 230v thermostat and 230v temperature control switch
Water System: water heater (gas or electric), fresh water tank, water pump, water gauges, taps and shower head
Electrical System: mains hook up input connector, ELCB, battery charger and distributor unit and interior lighting units (excluding bulbs)
Cassette Toilet: the cassette toilet is covered (excluding seals, valves and glands)
Heating System: thermostat, motor, switches, control unit, gas heater, flame failure device and igniter (excluding ducting and fittings)
Windows: the functionality of the opening and closing system (stays, handles and catches) and a warranty against the cracking of the acrylic
Upholstery: zips, seams and colour fastness
Whilst Bailey state they cover the first 24 months, in fact it is the standard appliance manufacturers warranty and any appliance manufacturers repair agent can recify faults without affecting the rest of the caravan warranty.