Ah I get you - I was unsure if it was entirely verified though, as media reports were placing her residence vaguely in Brixton, that Clapham Common may have been used to get there (which is just about feasible but unlikely IMO) and also that Brixton Water Lane was of interest, which is north of that Strava run route. To me, that looks like a starting point of Craster Road. It does, however, support the use of the A23 Sainsbury’s rather than either of the two north of there, and ties in with her friend’s pin drop on possible routes shared earlier in the week. So thanks for posting the Strava run, I had heard of it but was yet to find it.