Outdoor grown tomatoes are wind pollinated in the main. Here in the U.S., hot house growers often set up circulating fans to intro due air movement. Noting wrong with "tickling" or bumping the plants to assist in loosening the pollen.
Additionally, though, I'd check the undersides of the leaves to assure you haven't acquired new neighbors… spider mites. They will appear as very small reddish brown specks that suddenly move as you watch them.
There are several commercial, chemical sprays that will eradicate them, however, the simplest method is to mix about 2 fluid ounces of dish soap (think ya'll call it 'washing up soap?') into a quart of warmish water. After mixing well, but not sudsy, pour into a sizable spray bottle and literally soak the plant in the soapy water, assuring the undersides of the leaves are drenched as well. Won't hurt the plant and eliminates the bugs quickly...