On the website there is a list ,under recording, that tells you what to report for each bird (minimum quantities etc) And what are county rarities. Swans with cyggies - definitely. Good flocks of House Sparrows - Red List birds so if over about 30, yes please. Magpies - roost flocks of 20-30 +. Blackbirds - autumn and winter influxes, albinos, odd or interesting behaviour or odd nest sites. This is off the top of my head without refreshing my memory. It's a long tme since I wrote it!