Electronics firm Apple has admitted there have been problems with its new iPod Nano music player, after a string of complaints about damaged screens.

The smaller version of the popular iPod was hailed as a design breakthrough when it was unveiled a few weeks ago, with the cheapest model costing £140.

Apple says a manufacturing problem has left screens on one batch vulnerable to cracks and is offering replacements.

It says the problem affects fewer than a tenth of 1% of all Nanos shipped.