aren't they secured? Somebody who knows more will confirm but I'm sure they were.
Pretty sure the Wasps bond is a retail bond. Here's a brief description of what it is from google
" A retail bond is an IOU issued by a corporation to an investor. An investor lends the company money, and in return the company pays the debtor interest on that loan. Unlike cash bond deposits, retail bonds are not covered by the Financial Services Compensation Scheme"
Doesn't sound like it's secured against an asset to me but like I say I'm no expert in this field.
Here's some more from wikipedia that seems to indicate that bonds aren't secure.
"Bonds and stocks are both securities, but the major difference between the two is that (capital) stockholders have an equity stake in the company (i.e., they are owners), whereas bondholders have a creditor stake in the company (i.e., they are lenders). Being a creditor, bondholders have priority over stockholders. This means they will be repaid in advance of stockholders, but will rank behind secured creditors in the event of bankruptcy.[3] Another difference is that bonds usually have a defined term, or maturity, after which the bond is redeemed, whereas stocks are typically outstanding indefinitely. An exception is an irredeemable bond, such as a consol, which is a perpetuity, that is, a bond with no maturity."