The UK's Office of Fair Trading today (16 October) launched two probes into price promotions - with particular emphasis on the online channel.

One investigation is set to focus on what the watchdog called "behavioural advertising and customised pricing" - tactics used by online retailers by looking at a consumer's internet use.

The second probe will look at promotions across a wider range of retailers, including time-limited offers and the use of "complex pricing" - for example, 'three-for-two' offers.

OFT senior director Heather Clayton said: "'It is very important that the OFT's approach to potentially misleading practices remains well-informed by a sound evidence base, so we effectively protect consumers while allowing firms to compete freely."