A cockney is defined as as one born within the sound of the Bow Bells- the Wren church of St Mary-le-Bow, Cheapside. If that accent is a real cockney, I will eat those bells.

The accent has been borrowed, in a softened form across much of London, and the south east of england, and is often referred to as Estury English ,as the other main element in is from the Thames esury, i.e. parts of the Kent and Essex coasts.

I identify the accent in the adverts I saw as someone trying, quite sucessfully, to take on a understandable, but definite Estury English accent. They were almost certainly not brought up speaking witht hat accent though. It's just not quite right.

Ebbie, I can differentiate about 8-10 US regional accents, with varying degrees of precision. The people I've got to know those accents from have mainly been from the Coasts, so I get much less precise in the middle.