I grew up in a town 30mins from London (until I was 20) and I can hear my accent in her sometimes. Her accent it very fake chav though, I’ve grown up around ‘real chavs’, went to school with them etc and they sound way more posh then Helen!
Its weird though, because she shouldn’t sound very ‘London’ as she lived in Liverpool for a good portion of her childhood before moving back to Norfolk. Not sure where she lived or was born before moving to Liverpool but she didn’t spend enough time somewhere to adopt this chavvy accent....she should have grown out of it and be more Norfolk sounding than anything