Householders whose boxes are put out more than 26 weeks in the year will receive a £10 council tax rebate. The cash-back scheme has already been tested in Brent, with positive results. The number of residents using their boxes increased by 50 per cent when the trial began and the amount of waste recycled increased by 34 per cent. However, researchers found that despite being offered a £10 reward to recycle for at least half of a six-month period, 40 per cent of residents did not join in.