I just used Parcelforce to send a frame to Sweden.
Seems like I was undercharged at the P.O. as they only charged me the actual weight. Whereas online it said it needed to be volumetric weight and was working out at 95 quid! For 130 insurance cover and tracked it cost me just under 70.
I've heard Parcel2go are cheap and was tempted - but heard they can be a hassle as they don't pick up when they say they will, can be as much as a week later. And no number to call to complain if it goes missing, just online chat. Anyone had that experience?
For a 3rd party courier you can walk in to, and therefore actually complain to a person if it goes missing.... Mailboxes Etc seem to have flat rate shipping prices at some of their branches, as long as under 30kg. Can't see any size limit.
Edinburgh prices example: http://mailboxrental.mbe.co.uk/edinburgh/worldwide-package-delivery.php