Complaints about packages not being delivered on time by Amazon in the lead-up to Christmas are being considered by the advertising watchdog.
Customers signed up to the online goods giant's premium service Prime have raised concerns their expected delivery dates are not being met.
A spokeswoman for the Advertising Standards Authority confirmed it had received "a handful of complaints" from people who had signed up to Prime.
She said the complaints were being "considered" but added that no official investigation had been opened at this stage.
Amazon's Prime service costs £79 per year and includes unlimited one-day delivery, as well as access to films, music and television shows.