As always I have got so far with this then have ground to an undignified halt...rather like the van in question, I have the theme but 19 across - Realign starter's marks as above after imposition ( 6 ) is eluding me. None of the three words which I can find which fit h?m?us ( first blank is probably u ) makes sense in the context of the clue. As for the phrase to be written under the grid that is completely arcane. Programme title? Wording from the side of the van in question? Something else entirely? I am trying to pair the extra words up but to no avail. Clear pointers in the right direction would be much appreciated.