There are some other financial dangers here that people should be aware of:
If you go from Full Time Job to Furlough (paid) and you take a second job, then not only are you going to be whacked for top-rate tax most likely,
but if that “new” job blows up in your face the same as the OLD one did (which is a distinct possibility, if you think about it…)
Then come say, Christmas and you get let go…
…First of all - you’ll not get any notice. That’s a lot of things to get done very quickly at Christmas Time when those you’d need to be out meeting and greeting are already in Christmas wind-down mode. Then comes January when work is quiet in this line of business anyways…
Then your furlough pay drops dead on what? Haloween?
Having worked flat-out across say, Autumn - Your earnings will be high enough that you get no money until the new year if you sign-on for Universal Credit (last month’s earnings count against you for the first payment…)
and such a “JobLoser” might find themselves on “Jobseeker’s Allowance” instead, which is rather less than Universal Credit pays, especially if you are the only working person in the household already.
Your “2nd Job” started after the lockdown started. There won’t be much comeback with regards to built-up Severance Pay or even Redundancy, bearing in mind it is invariably going to be the government minimum, if the firm is in danger of going insolvent, which presumably is going to be the case…
Then there’s the possibility of “Employer Abuse” where they are not anywhere near insolvent, still have plenty of work etc. - but just want to turn over their entire staff, so their regulars don’t start getting pushy with their rates… “Be mean and keep 'em keen” kinda thing. 
If you see everyone around you getting the bullet - the last thing you’re gonna say when called into the office - is “Can I have a payrise please boss… I’ve not had one for three years now…”