Sadly not the first time this has happened...
Plymouth Naval Memorial
The memorial at RAF Down Ampney - or what remained of it when I went there in 2004
One the more audacious thefts took place a couple of years ago in the village of Chedzoy, Somerset. The bronze staute on this grave was stolen, the theives used a hiab type truck and a couple of locals asked why they were taking the statue away and were told that it was for repairs.