I have had two different friends to stay recently, each of whom told me they were glad I was here to interpret the speech of shop assistants. I have another couple of friends dropping in next week and they have been warned not to make such comments - for goodness sake this is the west of Glasgow it's hardly a strong accent. The response of the latest was, 'yes, but you're half Scottish anyway.' I'm not, not really, though my Mum periodically claims to be a Scot, and I'm told the SNP define a Scot as 'someone who chooses to live in Scotland' (does 'someone God sent/brought to Scotland' count?!).
Anyway, to my lovely Scots and Scottish (my Mum regularly reminds of the distinction 'people are Scots, things are Scottish' but it seems lost in much general speech) friends and neighbours I apologise for my sassenach friends. Although I do know someone who tells me they can't always understand Estuary English and another who claims an inability to comprehend Geordies... maybe it evens out?