Student accommodation developer and manager Unite said it has seen clear evidence of increased letting activity in recent weeks, partly due to promotions.Reservations for 2010/11 have increased to 71% from 59% at the end of February, the company said. Unite keeps its 2010/11 like-for-like sales growth forecast at 3% to 5%.The company now has about 2,300 bed spaces in London and has started two projects outside the capital that will deliver 1,000 bed spaces for 2011.Chief executive Mark Allan said the company's development plans 'provide UNITE with strong and tangible foundations for growth in changing economic conditions and an evolving market.'