Lots in the travel industry won't be able to go back without being bored as travel is still very thin on the ground for now.
The last time I was in the local town centre two travel agents ( Co-op and ? TUI ) were open. Looking in each at least three staff at desks but not one customer between them so where is the income to pay these staff, overheads etc. coming from ?
Even if UK Freedom Day had gone ahead today what difference would it have made to these? Go further and add a few more countries on the UK green list plus for those who are double vaccinated less restrictions to amber list countries and how much more business would there be ? Just one factor is the restrictions in other countries both for all and just for incoming visitors.
As well as all the customer facing staff currently on furlough there must be a lot from behind the scenes support e.g. cruise/ferry terminals, airports, ship and aircraft maintenance. This then rattles along to the suppliers of maintenance items. Even further along manufacturers and the associated supply chain. This includes aircraft, ships, terminal technical equipment and fixtures.
Taking another path while UK staycations will offset some of the lack of tourists into the UK I see gaps plus come September once the schools return demand will drop then roll off further by the end of September. One gap is coach shuttles from airports to hotels and then the days trips with guides e.g. tours of London, Oxford, Stratford-upon-Avon, Cambridge, York etc. I don't see UK staycations plugging all of this either directly or by creating alternative demand. Come October will there be any foreign tourists let alone numbers similar to 2019 ?
I'm sure some who have posted above will strongly disagree but my view is there either has to be support past September for certain groups or there will be even more moving from furlough to redundant so adding the the number of unemployed and claiming benefits. Either way short term the government pays out, longer term with support some employment and the associated skills are retained.