Looks really good so far Simon! Certainly has the Dallam feel about it for sure, (me living in Warrington) although if you can find about 5 N gauge Chavs you'll be spot on!
You could also model an Arriva service using Dallam as a turn back, as i've seen it happen quite a lot when disruption occurs on the Manchester or Chester line where a set is sent down to the signals and over the crossover at Dallam and then departs on the correct line. Before now this has happened as the driver has refused ti start from the ground signal on WBQ plat 4! (this being after all the passengers had been loaded...)
The 6F07 flow could look really good too if you ever modelled present day Dallam or an N gauge reach stacker could be plonked outside the warehouse to model the safeway container flow there (think it was either Unit45 containers or Russel ones) and a few white with orange stripe tanks carrying fluoride from the continent.
Or indeed a dumped, failed 60009 Union of south Africa, as it would be accurate!