Article 50 forbids any talk on the terms of departure until formal notification of withdrawal is given. The EU will then take some time to finalise its negotiating position. Reports coming out of Brussels noted that deliberations could start only in June.
Dr White said the Bills, dealing with issues such as immigration procedures, would be on top of the Great Repeal Bill, which will incorporate European Union law into British law.
This will be a "long game".
"I have always remained firm in my belief that people did not vote to become poorer as a outcome of leaving the EU".
Up to early 2019, Britain will remain a full European Union member and nothing will change beyond the exclusion of its representatives from some European Union meetings where the approach of the remaining 27 to Brexit is discussed.
Scottish Government minister Michael Russell complained that the UK Government "somehow forgot to inform" the devolved administrations of the timetable for Article 50, leaving them to hear about it from the media.
May, who was visiting Swansea on Monday, meant to visit Northern Ireland and Scotland before the formal notification was sent by letter on 29 March, Downing Street said.
But in a stark contrast, Ms Lea railed against Mr Khan and suggested allowing more European Union regulation could harm Britain's post-Brexit economy. By 52% to 22% people think it would be good for Britain, 61% they think it would respect the result of the referendum, by 49% to 25% people would be pleased at such an outcome.
Video: How long until the United Kingdom leaves the EU?
The announcement on the timing of Article 50 comes shortly after European Commission president Jean-Claude Juncker warned that Britain may have to abandon its hopes of a trade deal if it rejects the terms offered by the EU - which are widely expected to include a "divorce bill" of as much as £50 billion. Asked what should happen next, the most popular answer was - predictably - to go back and try and get a better deal.
We assumed that there would be a deal on preserving the existing rights for EU living in Britain, and British citizens living in the EU and that Britain and the EU would continue to co-operate on security matters.
The EU leaders will later hold a summit in April or May to decide a final response.
There are vital issues here for Ireland: the future of the Border and the Common Travel Area and the ability of Irish people to work freely in the United Kingdom and vice versa.
"She has chosen the hardest and most divisive form of Brexit, choosing to take us out of the Single Market before she has even tried to negotiate".
The mood music will also be important.
Demands for a large exit fee for Britain and a view in some member states that it must be "punished" for leaving to discourage others thus carry dangers from an Irish viewpoint. Next Wednesday, the Government will deliver on that decision and formally start the process by triggering Article 50.
An EU spokesman said it was "ready and waiting" for the letter.
She added: "The Prime Minister's attitude should worry all of us hoping that negotiations with Europe will not be a disaster because - and let me put it bluntly - if she shows the same condescension and inflexibility, the same tin ear, to other European Union countries as she has to Scotland then Brexit process will hit the rocks".