I have not received a copy of that letter. I shall keep a candle burning in the window for its arrival! All change brings with it friction costs. That greater the change, the greater the friction. The faster the chance, the greater the friction. The speed of change effects every part of the friction costs of that change - I call that the 'Yellow car effect.' Imagine that we have an absolute dictatorship and the dictator decides that the safest colour for any and all vehicles is bright yellow. If the dictator allows the change to take place gradually, say over the next 25 years, the friction costs will be almost nil. New cars will have to be yellow, but old cars, trucks, busses, ambulances and trains have 25 years to get a respray and have that new colour registered in their documentation. Now imagine what would happen, if our dictator insists on all vehicles of any type has to be coloured yellow and that colour must be entered into the registration documents by 6am tomorrow - on pain of death! All trains, busses, trucks and cars (that do not happen to be yellow already!) would not be able to go about their daily routines. The economy would collapse and we would be reduced to a subsistence society using barter to survive! Let me put the problem for businesses another way - if we crash out of the EU with no deal, no amount of preparation that I may engage in for my business can help. If we get a slow and well-thought-out steady transition deal, I do not need to prepare for any sudden and violent change. Most importantly - prepare for what exactly?