In the treatment of early breast cancer adjuvant irradiation improves local control following both mastectomy and breast-conserving surgery. For women at high risk of relapse it also increases survival. Breast radiotherapy is usually given using simple planning techniques and serious morbidity is unusual. The greatest concern following adjuvant breast irradiation is of an increase in cardiovascular mortality after 15-20 years. New techniques of breast irradiation including conformal radiotherapy and intensity-modulated radiotherapy (IMRT) have been shown to reduce cardiac and lung irradiation. In addition, improved dosimetry within the breast may improve both local control and cosmesis. To replace current radiotherapy techniques with those requiring more complex planning would demand an increase in resources including both machinery and staff. In this review we outline the indications and benefits of breast radiotherapy along with the planning process. Technical advances are discussed within the context of improving outcome at a time of limited national resources.