Martinidoc - I think you may well find that the current company is Gill Aviation Ltd. You can check the details online at
Companies House
Outback - actually, it was the Halifax that bought the Bank of Scotland, so if anyone is to blame it's them! So much for that "Extra Help" they offer!
Deepest sympathies to all affected by Gill's closure - keep your chins up and hopefully something will transpire for you all.