Numerous UK airlines have gone bust in recent years such as XL, Monarch and Thomas Cook to name a few. I worked at Thomas Cook. The last crew into our base on the evening they went bust were told to park on a remote stand and the aircraft was blocked in by ground servicing equipment and a lien taped into the fuselage near the forward door. The aircraft stayed like that until their leasing companies came with contract crews to retrieve their aircraft. A nasty business for all concerned.