Why would someone ship me coal? I have 100k coal just sitting in my stocks, I produce 13k coal per hour and only use about 12k of it so far.
The fuel used to ship 30k coal is worth about 65000 coal if you take into account the difficulty of producing fuel over the difficulty of producing coal, plus his trucks are going to be running out of fuel and won't be able to make it back.
And now the coal is going to Manchester, and 30k cement is being shipped back. Uh, you guys do realize your trucks won't make it across the entirity of the British Isles on one tank of fuel, right? You're gonna run out. It's already used 39% of its fuel for traveling 23 tiles, with 45 tiles to go. That means it needs around 77% of a fuel tank to get there, and it only has 61% left. Then you have to somehow come up with another 116% of a fuel tank to get back. Is your truck carrying 232% of its maximum fuel? Even if it was, you'd be burning over 6200 fuel between you just to trade 30,000 cement and 30,000 coal. Just the POWER requirement of a level 10 refinery producing 6200 would burn 23,560 coal, and that's not even counting the 12,400 oil and the 62 hours of waiting for the fuel to be produced. A level 10 coal mine could produce the 30k coal in 15 hours and takes less than half the resources to set up.
In short, long distance trades like that need trains.
-edit- It's like watching a train wreck in slow motion. Do these guys know something I don't? Do trucks keep going when their fuel runs out? It's less than half way there and the fuel is down to 48%. Now its at the point where it can't reach its destination OR turn back and make it home. Unless they magically keep running on rainbows and happy thoughts, they're not gonna make it.