Although I've come across them during the day in the countryside, in the suburbs they wisely use the cover of darkness. Usually I only spot them in the distance as they cross the roads between parkland and gardens. Their eyes reflect the car headlights, and combined with the pale part of their ears, they can take on the appearance of a Hyena when viewed head on!
Fruitless attempts to film them in an urban setting have left me frustrated, so it was ironic that, after many hours of searching I managed to video this chap just a few hundred yards away from my house.
Their call is very similar to a fox and easily confused (hear it here), but it is slightly harsher, more metallic and less 'musical'. So if you hear what you think are foxes calling in the night, the roses aren't flowering too well this year, and the garden birds are looking hungry... then maybe you have a deer friend too!