Whenever I have used parcel2go (the only courier I use for large items, or anything over 2kg for that matter!) I use DHL, on the 24-72 hour delivery, £8.20 incvat per item, butthen I get the alloy wheels and wrap them in industrial cling film as a pack of 2, so it only costs me £20 inc insurance. Have never had anyone question me doing it this way either!