Amazon is now also £249.99
If you pre ordered on Amazon UK at £229.99 price you will only be charged that price or less if price drops more
Amazon prices can drop/increase at various stages before release date
You will automatically get a lower price if a price drop happens after you pre orderd
Amazon only take payment when dispatching your order
Amazon Pre Order Price Guarentee cover upto close of busiines on release date
Sometimes if a price drop happens the day after release date you get a refund of price difference
Even if price drops on release date itself after you already had payment taken and your order was dispatched
Amazon would refund the difference a few days later
As HMV is still £229.99 it's likely Amazon will price match this again unless HMV also increase price to £249.99