The quarantine period for travellers arriving in the UK is likely only to be cut to about a week, according to the transport secretary, under a “test and release” scheme being considered by the government’s taskforce.

Grant Shapps said the new regime, which is due to be confirmed in November, would require a single coronavirus test, to be taken about a week after arrival and paid for privately.

In a recorded speech to the annual convention of the UK travel association, Abta, Shapps said the government had been working “extensively with health experts” since the announcement last week of a global travel taskforce, examining testing proposals put forward by the industry.

Shapps said: “As I announced last week, this will include the feasibility of one test taken after a period of self-isolation provided by the private sector and at the cost of the passenger.”

He said Britain could be a trailblazer for an alternative proposal, an internationally agreed regime “where tests and perhaps isolation take place prior to travel and after travel, and we would require no quarantine”.

However, Abta accused Shapps of failing to “bat for his sector”, being too slow to provide support and create an airport Covid-19 testing regime. Abta said thousands more jobs were at risk when the furlough scheme ends and that confused government policies on quarantine were deterring travel.

In a withering assessment of Shapps’ speech, which was designed to reassure the beleaguered travel industry, Abta’s chief executive, Mark Tanzer, said it was “very worrying” and “didn’t take onboard that we are still in the middle of this crisis”.

But Tanzer said: “The travel corridors he mentioned, they’re mainly shut. We’ve seen none of the results … it absolutely has to hit the ground, this testing regime, if we’re to move out of this crisis.”

He was scathing about Shapps’ assertion that the taskforce would be building on work already done by the government, including establishing that Covid-19 tests would not work on day zero of transmission.

“If it’s taken six months to realise that, it’s not huge progress,” Tanzer said, adding: “He is the secretary of state for transport. A lot of other sectors will be queueing outside No 11 … he has to go in and bat for this sector.

“We haven’t seen the evidence, the financial support just hasn’t been there. We need to see the evidence of what he’s doing.”

Abta said the £60bn travel sector needed urgent, tailored government support, including recovery grants for firms and a review of the job-support scheme, otherwise more companies would collapse and jobs disappear.

Abta unveiled research that showed 15% of Britons took a foreign holiday in the six months to July 2020, compared with 64% in the 12 months to July 2019. It also found 93% of potential customers had been deterred from booking by potential last-minute changes to travel advice.

Tanzer said he was also concerned by Shapps’ admission that no deal had been reached over air travel between the EU and the UK at the end of the transition period on 31 December, with no backstop agreement of the kind agreed before the original Brexit date in 2019.

Shapps said: “We expect the EU to bring forward contingency measures as it has done before to ensure flights will continue if negotiations are unsuccessful.”

Tanzer said: “It’s only 78 days. If people aren’t sure that the flights will fly, that will be just another deterrent before they book.”

He added: “We need to move beyond words, get systems in place and customer confidence that they work and they’re able to travel … otherwise this will be a very prolonged depression for the travel industry.”