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Three new releases occupy the top three places in this week's UK and Ireland box office chart, with pharmaceutical thriller Limitless in pole position.

The film - about a writer, played by Hangover star Bradley Cooper, who takes a mind-enhancing pill - took more than £2 million between Friday and Sunday.

Children's animation A Turtle's Tale entered the chart at two, just ahead of Roman action adventure The Eagle.

Rango, last week's top film, fell down to four in this week's rundown.

Limitless - which also stars Robert De Niro and Australian actress Abbie Cornish - was the top film at the US and Canada box office last weekend.

This weekend, however, that honour went to comedy sequel Diary of a Wimpy Kid: Rodrick Rules, which took $23.8m (£14.8m) between Friday and Sunday.

Its success came at the expense of the action fantasy Sucker Punch, which opened in second place with first weekend takings of $19.1m (£11.9m).

Sucker Punch opens in the UK on Friday, when it will do battle with Hop, another animated comedy, and science-fiction thriller Source Code.