Re: https://www.gov.uk/your-rights-if-your-employer-is-insolvent
If you go this route, go with your eyes open. Don't expect to get much out, since its all based on on whats left in the pot after various groups have taken their bit out first.
I've been through this once. You do a pile of paperwork and don't end up with a lot to show for it at the end. Yes the forms may say you are owed loads, but that won't generally end up in your bank for the reason stated above..