Hello,
I'm just along from you in Kent. Never quite sure when you cross the border into smallholding - I've got veges, soft fruit, fruit trees, geese, ducks, chickens and bees but not sure I'm smallholding proper yet. Still deliberating over pigs but not convinced -having seen the damage they do!
Welcome here anyhow - a wealth of knowledge available (not mine). And yes, go for both ducks and chickens although ducks are a dabbling, messy bunch I have to warn you! My ducks are better layers than the chickens though (very breed dependent).
H