At this time of year Roe bucks will be laying up and recuperating after the rut. You tend not to see them very much, although they still have to feed and in my opinion tend to do this more under the hours of darkness.
Fallow Bucks will shortly start to move towards the rutting areas and will often appear on land that people have for a brief while before they disperse. There are always times of year when deer seem to be non existent, even on large areas. Fallow on the other hand along with Sika, can be the most difficult of deer to manage the numbers of. However with the rut coming in about 5 to 6 weeks time (depending on weather and where you live) the bucks will be at their heaviest and sometimes appear briefly in areas where you least expect them.