Some links to further expert comment on the issue of extension to the transition period is provided below:
UK in a Changing Europe - Covid-19 crisis strengthens case for extension 23 April 2020
Prospect Magazine - Civil service grandees call for Brexit transition extension 22 April 2020
Julian Jessop Independent Economist - The pro and cons of extending the Brexit transition 22 April 2020
Centre for European Reform - Why the UK should extend the transition period 20 April 2020
UK in a Changing Europe - The transition period needs to be extended 20 April 2020
European Policy Centre - The need for a longer transition 18 March 2020
A recent SPICe Spotlight blog summarised the key challenges for the UK government in its considerations over whether an extension to the transition period should be sought.