Im South African going to the UK on holiday. I would like to do a one day Paris tour leaving from London. Do I also need to apply for a Schengen visa even if it an in and out trip?
If you need a visa you need it even when you just cross the border and return in a few minutes.
And what is more, if there is any doubt about your UK visa or status, they can stop you in France and not allow you to return to London.