If a weed is a plant growing in the wrong place, then this sunflower is indeed, a weed. Though possibly a welcome one.
We don't recall planting any, so it has probably blown in from a neighbour's garden and seeded itself next to the fence.
We're having a few interesting days at work. Considering the August Bank Holiday is normally very quiet, we have had rather more issues to deal with than we expected. Hopefully, today being a normal office day will see the return of normality.