Agreed, Mrs Duck, the Royal Mail leaflet gives a max diameter of 5mm for a letter. Diane is obviously on cosy terms with her post office.

Or are we talking about CDs in a plastic slip-cover, not a "jewel case"?

Sorry I added to the confusion, Villan. It still might be worth splitting them into two packages, though, since the 2 kg threshold is so significant. Give it a try and do the maths.

I think you'll find Parcel Force much more expensive.

Marje