I'm lucky that I fly back and forth quite a bit for work (and I still have a house over there) so have a good standing with British Airways, that doubles my baggage allowance. Craziest things I have carried....a full set of tins (front, rear fender and tank), set of exhausts, a pair of fold up beds, literally the 'kitchen sink' for the motorhome I am having rebuilt - they BA staff are used to me showing up with something crazy. Some items are just too big, so get shipped. I friend of mine lives in Surrey, BC and just shipped all his furniture from the UK using Interparcel. In each case we are shipping 'personal property' not sure if that makes any difference? I am flying to London on Friday (working in Portugal next week), but wont have a chance to get to my house in Kent, or I would have offered to carry the parts back.
