The government has set March 17 as the earliest date from which international travel could resume.

Courts referred to travel restarting “at some point after May 17”. Asked by the committee to explain, he said: “I understand the requirement for as much certainty as possible. At this stage, it would be premature to be too precise. We do need to work through some really quite complicated issues.

“We have said there won’t be any travel before May 17 and we’ll look at travel restarting as soon as possible after that.”

He insisted: “We don’t yet understand the extent to which vaccinations reduce transmission and every country will need to be happy with any system used.

“The second point is new variants. We have to guard against these. The science is still catching up.”

Courts argued: “We had the earlier Global Travel Taskforce but a number of things have changed. It’s critical we take stock and work closely with all our sector colleagues to make progress.

“All you are hearing from other countries is an intention to do something.”

He told MPs: “We’re looking at a suite of factors, building on the suite of measures already in place. We would like to see travel facilitated in a way that is smoother, in a way that uses technology. I expect to see a suite of measures.”

Asked whether people can be confident to book summer holidays, Courts said: “We’ve seen this is an unpredictable virus. It is not possible to predict. It isn’t possible to tell individuals or families what to do.

“I suggest what people have to do is give themselves options, give themselves flexibility, look at booking terms, look at insurance.”

He confirmed the task force report would go to the Prime Minister for consideration before its recommendations are made public.

Courts said: “We will be laying out a plan in April and then looking to operationalize that. April 12 will be the date we report back to the Prime Minister. We then have a process of looking at the recommendations.”

He argued: “The date we should be concerned about is the date people are due to travel.

“The evidence looks promising but we want to make sure what is in place is sustainable. We have to be slightly cautious at the moment. This has to be robust.”