March 8th, no.
March 29th, maybe but it would be at least advised against.
April 12th (if not delayed), yes.
Until the legislation is published no one can given actual definitive advice, but my reading of the government’s plan is that from March 29th it will likely be legally possible but heavily advised against, though it possibly could still be restricted depending on how they write the law.
From 8 March, the Stay at Home restriction will continue but it will be amended so that people can leave home for recreation as well as exercise outdoors - with their own household, support or childcare bubble, or with one person from another household. Social distancing and other safe behaviours should be followed.
From 29 March there is an opportunity for some further limited changes as part of Step 1, as most schools start to break up for the Easter holidays.
As a result of these changes, people will no longer be legally required to Stay at Home. Many of the lockdown restrictions, however, will remain in place. Unless an exemption already applies, it will not be possible to meet people from other households indoors and many business premises will remain shut. Guidance will set out that people should continue to work from home where they can. People should continue to minimise travel wherever possible, and should not be staying away from home overnight at this stage.
However although Step 2 still says to minimize domestic travel in the text, it is when they reopen outdoor attractions. So it would be impossible for them take action against people just riding (subject to social distancing etc.) when saying it is okay to travel to theme parks and other outdoor hospitality businesses.
As set out above, around four weeks is required to see the impact of the previous step in the data and the Government has committed to provide a further week’s notice to businesses. Step 2 will therefore take place no earlier than 12 April, subject to an assessment of the data against the four tests. If Step 2 is delayed, subsequent steps will need to be pushed back in order to maintain the necessary five week period to assess the impact of each step and provide notice.
The majority of outdoor settings and attractions can also reopen, including outdoor hospitality, zoos, theme parks, drive-in cinemas and drive-in performances events. The rules on social contact outdoors will apply in these settings.
People should continue to work from home where they can, minimise domestic travel where they can. International holidays will still be prohibited.
It also does not say to minimize travel in the summary table later on in the document.
The document is here: