I read that article as well when it states,
The article doesn't appear to say the British woman in question was Carole Tranmer.
CB's most distinguished feature is his pockmarked face.
Did Tasmin describe the man as having a pockmarked face before or after CB's photo was circulated?
Isn't it more likely CAT simply made up some fictitious person to interject herself, and by definition her husband, as witnesses before investigators sought them out as potential witnesses and suspects being as they were in such close proximity?
And/or another more likely scenario is the person she saw exiting 5B was Matthew Oldfied who according to all accounts was leaving his apartment around the time CAT claims she saw a suspicious man? MO's young daughter was having an afternoon nap so this would explain why the 'suspicious man' closed the gate gently so as not to wake her?
CAT claimed she saw the 'suspicious man' after she returned from the restaurant in Luz and was sat on PF's balcony. This was between approx 3.30pm - 6.30pm. The 'suspicious man' left 5B but according to the Oldfields either one of them was in the apartment at this time and MO left for a sailing lesson.
I think its utterly ludicrious to suggest would be child abductors and/or burglars carry out obvious recces during the middle of the day.