Owl haunts in London and the South East

The Tower, seen from the Orchard, on a winter's day at Sissinghurst Castle, Kent

At Osterley Park, Greater London, you can see barn owls and possibly little owls.

Barn owls nest in and around the buildings at Stowe, Buckinghamshire, and can often be seen at dusk when they are leaving their nests.
 
Three types of owl can be spotted at Hatchlands Park, Surrey: barn owls, tawny owls and little owls.
 
Polesden Lacey in Surrey and the Mottistone Estate on the Isle of Wight are also frequent owl haunts, and you can watch out for the distinctive barn owl hunting at dusk at Sissinghurst Castle, Kent.