I think the ‘plan’ was to negotiate with the EU about the terms of the UK’s withdrawal.
However, sadly it has now become apparent today that the EU has no real intention of actually negotiating anything. In order to be able to truly ‘negotiate’ something, both sides have to be willing to concede certain points to the other side. In my book that is called making concessions, but unfortunately today we have heard M. Barnier say, "Nous ne demandons pas aux Britanniques de faire des “concessions”. L’accord auquel nous travaillons ne se construira pas sur des “concessions”.
Clearly the EU side are not interested in conceding anything, and without concessions from both sides there is not going to be any agreement.
So there we have a clear indication that there will be no agreement in relation to Citizens Rights, the Irish Border, or the Financial Severance unless the UK just rolls over and accepts what the EU wants in entirety.
The EU won’t talk about trade until those three issues are sorted, so unless the UK just rolls over in relation to them, there are not going to be any trade talks at all.
The EU has no interest in making any concessions according to M. Barnier, and that makes reasonable negotiation impossible, and so the UK’s ‘plan’ has to be reworked towards either giving the EU everything that they demand, or just simply walking away from what are currently farcical and rather pointless talks.