I'm no expert, but I have helped my dad put troughings up when he was still working.
We're gonna need more info so we can give you more accurate information, like:
What sort of troughings are you replacing (plastic, wood, etc)??
What is the total length of troughings??
How high/awkward are the troughings??
Going off what my dad used to charge, I'd say £1400 is VERY excessive, but we need more info first .....