The approach appeared normal until 150 ft agl when the aircraft went slightly above the glide slope. The first officer reduced the pitch attitude to 2.1 deg. there was no further change in aircraft attitude until under 30 ft agl; the rate of descent remained at 900 ft/min. The commander made a warning call to the first officer and the right side stick was moved back. touchdown was firm. The aircraft ‘bounced’ slightly; the first officer moved his side stick forward momentarily to 1.4 deg aft of neutral before moving it back to 11.2 deg. The pitch attitude of the aircraft continued to increase until it was arrested by a positive movement of the side stick by the commander. However, the pitch attitude was just sufficient to cause a tail strike. The sequence started when the flare was initiated late with too slow side stick demand. The damage to the aircraft was minimised by the positive control movements made by the commander once he had taken control.