Alison H wrote:
I think the first noticeable one was Jan Molby, who used to talk broad Scouse when he was at Liverpool

. Jesper Olsen was at United at the same time, and I don't remember him sounding noticeably Mancunian, but Ole certainly does, and Schmeichel. Northern English accents are supposed to have links to the North Germanic languages, so maybe there's something in it. You certainly don't hear, say, Eric Cantona sounding like he comes from Stretford! I tried to learn a bit of Norwegian, Swedish and Danish (er, all at once) before a tour of Scandinavia, and words like fjell (fell), dal (dale) and barn (bairn) are so similar to Northern English.
Having read Malory Towers, St Clare's and the Chalet School, I assumed that my French teacher at secondary school would be A Real Frenchwoman, and was rather disappointed to find out that she was no more French than I was. I always find it odd that, apart from Maria Marani briefly, the CS never employed a native speaker to teach German. I'm sure Miss Denny had a perfect accent

, but an Englishwoman trying to teach French girls to speak German sounds a bit messy.
Yes! I'd forgotten about Molby's Scouse accent. The only foreign footballer I can think of who ISN'T Scandinavian, but who has a northern English twang (Wigan?) is Roberto Martinez, who's Spanish. He's lived in the UK for ages and the way he says 'centre half' sounds almost Scouse.
We had a French language assistant at our high school, and a German one, but all our language teachers were British. At university, it was more mixed. My tutor, who was a real-life Bill in terms of personality, was German and so were a few of the other lecturers, and all the language assistants were (and one was Austrian and I couldn't understand a word she said at first!)