AS you havn't had an answer yet, I can tell you to get to St Margarets turn left as you leave Dover ferry terminal, go to top of hill, at roundabout turn right. The road to St margarets Bay is off this road which is towards Deal.
I'm not sure where the monument you mention is though.
Hopes this helps.
Thanks a lot Keith. I will follow your instructions. I am sure someone along the route will point me in the right direction. I usually park along the Promenade, where there is space, but would like to see St Margareth, as I have read a few posts about this place for parking and overnighting. Thanks again