The Fishmate Feeder from Petmate will feed 5 or 6 average goldfish for a week. Just hang it over the pond or large aquarium and set the timer. It's easy to control the amount of food your fish get.
Bradshaws Direct (UK) - suppliers of pond liners (pvc and butyl liners), underlay, pond pumps, filters, pond vacuums, fish food, water features and many other water garden accessories.