Variety: Carlton
Flowering heights:  20 to 24 ins
Month:  late March into April
Clare Bulb Co comment: Carlton is the world's favourite daffodil, i.e. it is the most commonly grown variety. This is because it is strong stemmed, late flowering, and has a large, long-lasting flower. 
The top picture shows some long established Carlton flowering by our river. I took the lower picture north of Aberdeen, so they are pretty hardy too.