I don't know where you get your information from with regard to the desire for a trade war. It is wishful thinking at best. The UK will not come to any settlement within the allotted time frame with the EU and will have to accept default terms if they want to continue trading. I don't think we can underestimate the enmity that already exists because of Brexit. There will be a huge payback for this. What is left of the UK will have a huge hostile super-power right on its doorstep.