Afternoon tea in Poole comes with a view more often than not, which is the main reason to have it here rather than anywhere else.
With a view
The hotels around Sandbanks and the harbour serve the full version, sandwiches through to cakes, looking out over water. Book ahead, particularly at weekends.
In a garden
Compton Acres has a tea room set among its themed gardens, which turns tea into an afternoon rather than an hour.
In the villages
Canford Cliffs, Ashley Cross and the Old Town all have tea rooms and cafes doing scones properly. See cafes and delis for the wider coffee and cake scene.