I buy most of my replacement parts (new or used) from the UK. The courriers that have worked the best for "large" articles, have been GLS and DHL. Best means good price, quick delivery and, of course, no problem with the items.
GLS and DHL if arranged by the UK seller. If they don't trust to sell abroad (unfortunatelly, that happens), I use my own courrier, with comes muuuuuch more expensive for me.
The largest parts I bought were a set of alloy wheels and a sunroof. But... the seller prepared a good package (with the above mentioned protection items) and I only had to arrange the pick-up.
By the way, I too could use some help from FCCUK members when in need of buying parts...
