Hi Trisha,
Just buy most of your things at the usual places, like Tesco, Argos etc.
Cheap ordinary plates and dishes are much more preferable to plastic or melamine, which discolour easily.
Apart from things like Aquarolls and wastemasters, or the waterhog equivalents, dont go buying in caravan accessory shops, unless you like throwing money away!!!
Same goes for most electrical items, like TV's,the cheap Tesco versions will work just as well on 240v in a caravan as the mega expensive "caravan" TV's