Unlikely.
Voice-overs are selected on their suitability for the product.
Irish and Scots accents are particularly popular because they are seem as warm and comforting.
Yorkshire accents denote a down-to-earth no-nonsense sound - as in the Broadband ad that even uses a northern expression - "We'll do you proud..." to underline its lack of patience with more 'southern' nonsense.
Some use 'shouty' voices for impact, like the infamous 'Barry Scott' others go for sex appeal - anything with Joanna Lumley.
The voices and scenarios for adverts are all carefully chosen to appeal to the target audiences, so regional variations in audiences are not really a factor.