Thanks for the speedy reply.
I have been in contact with Flybe and they have confirmed that it is possible for me to carry it. Obviously it will be checked in and well wrapped. Unfortunately I only have a leather 'bag' for it so I will consider borrowing a hard case or similar.
I'm pretty sure that it's under 12ft -lb (or so I'm told with a wink by the owner) but how does one go about proving this?