Adults love summer revision

Holiday workbooks originally meant for children to revise school subjects during the summer are proving a surprise hit with adults.

The lastest offering from publishers Chiflet & Cie has sold 100,000 copies since it went on sale in May.

Since the firm first started targetting revision books at the adult market in 2006 it has sold more nearly one million copies.

The books capitalise on nostalgia, offering a chance to rediscover the joys of maths, long-forgotten formulae, French, history, geography and general knowledge.