British publisher Bloomsbury’s eBook sales spiked 564% in the first half of 2011. eBook sales brought in £2.5 million for the company, in the six months that ended August 31, 2011. This is up from the £0.4 million that the publisher earned from eBook sales during the same period in 2010.

Overall, the publishing house that publishes the Harry Potter books and Elizabeth Gilbert‘s bestseller Eat, Pray, Love, had a successful six month period. Turnover was 16% to £44.9 million, from £38.6 million in 2010. The adult division, which focused on digital investment during the period, generated 49% of group sales. This was down from 52% of group sales in 2010, however, sales were up by 10.5% year-over-year to £22.1 million.

The company will continue to focus on its digital business going forward. For example, the children’s division which released four enhanced ebooks during the period, will release its first enhanced title and simultaneous print run next year.