I was thinking about this again this morning.
And then I remembered, that before I had the fiesta tdci, I had a 2006 Renault Clio tdci, which I believe also had a DPF.
Again, i was trundling around town exactly like i have been with the fiesta and now the focus, and i had that car for about 2 years, and didn't have a problem with that either,
On one hand I think I'm going to be spending quite a bit of money on it, but on the other hand I think back to previous cars with dpf's and didn't have a problem and that was without motorway driving on a regular basis.
There is a good thing to come out of this though, and I have learnt a few things. As long as you learn something it's not wasted.