i work in insolvency, an administration is done ahead of a liquidation when there will be a better outcome, for example the administrators can trade a business, sell parts of it etc. in both these scenarios it is possible he will keep his job. If the administrators trade the company or part of it is sold he will keep the same terms of employment under the TUPE regulations.
if he is made redundant be will receive arrears of wages, holiday pay
owed, statutory redundancy pay (if eligible) and pay in lieu of notice (PILON) if he finds a job before being made redundant he won’t get redundancy and the PILON will be reduced by the wages he receives (because you can’t work 2 jobs at once). He will claim from the redundancy payments service and the holiday, wages and redundancy will come through first then he will be asked whether he’s had a new job since being made redundant and they will calculate and pay the PILON - he does have a duty to try to reduce this as much as possible. If he has taken more holiday than he’s accrued then this isn’t deducted, this is more usual when the insolvency happens in late summer with a December holiday year.
it seems scary but if you have a good firm of insolvency practitioners then they will talk him through the process and help him with the forms/answer questions. He possibly will have limited access to the office so make sure he collects any payslips etc he needs to be able to complete the forms as they will ask for wage amounts and holiday owed and where there is a difference to what the insolvency practitioner puts this can slow things down a bit whilst it is checked.
if he is made redundant, I hope he manages to secure another job quickly. We used to get a nice handy book from citizens advice to hand out but these were canned in 2010, but they can be quite helpful with advice if you need it.