One problem identified in the tender is that voters who backed Brexit are less likely to make preparations for it because they don’t believe Britain’s departure from the bloc will have negative consequences.
Food and medicine suppliers are already stretched. A no-deal Brexit could tip them over the edge.
Ashford MP Damian Green said he was "delighted" the "wretched barriers" were being removed.
Several amendments are being tabled to the European Union (Withdrawal Agreement) Bill.
Workers placed 7,500 cones along the M20 in Kent to create a contraflow system to deal with the lorry backlog expected if Britain crashed out of the EU without a deal
The ex-justice secretary warned that even if Johnson wanted to extend the transition period to negotiate a new free trade deal with the EU, he would be unable to do so.
The contingency arrangements will see speed limits cut from 60mph to 40mph to avoid congestion at Portsmouth International Port.
The UK Cabinet minister appeared via video link from Westminster at the Finance and Constitution Committee at Holyrood.
Westminster Brexit committee also heard from a senior police officer who warned of a potential upsurge in dissident republican violence after Brexit.