Drained

We have a drainage problem that has gone on some time despite the efforts of a plumber and Scottish Water. Even I had a go tonight with some drain rods but to no avail. The situation is not helped by the scaffolders having decided to put one of their poles on top of one the drain covers outside the house so no-one can have a look in that drain to see if the blockage is down there till they decide to take the scaffold down, whcih was scheduled to happed several weeks ago.