A piece in the Daily Telegraph says: "Having been shunted endlessly between foster parents and family members after the death of his alcoholic mother, Hendrix loved simple, childlike domestic pleasures: such as playing with a Scalextric racing car set and watching Coronation Street."
In addition, there's an interview on the BBC website with Kathy Etchingham, Hendrix's 'Foxy Lady'. The article says that the couple "liked to relax by watching Coronation Street".
So it seems like he was a fan and as far as I'm concerned that's proof enough for me that the track was influenced by the theme tune to our favourite drama.
Finally did you know that the theme tune is also known as 'Capri', because that's where it was composed?