Corporate bonds

[strawberry]

Looking at all the bonds available I've come across the west Bromwich bs 6.15 PIBS. coupon is 6.15% but price is 28p down from launch in 2005 of 99.83. Bond doesn't appear to have a redemption date. This means the yield is around 24%!!. Can anyone see the flaw?

 

West Bromwich Building Society (WBS) 6.15% Permanent Interest Bearing Shares Share Price | WBS