I Have also used Martin many times very good ,more recently I have been bringing stuff back in my own luggage ie the stuff shot the year before from namibia especially skins smaller skull mounts even a kudu ...as long as paperwork there side is in order in case you are stopped at check in and you have your permit , pay for additional luggage and push airline limits on sizes ,The uk side has been easy no questions ....
Just check the arline carrier baggage restrictions, its legaly yours , you paid for it ,had it processed properly and certified , legaly taken etc etc ,
if its not on a permit you have a gift letter from outfitter you should be good to go ......
On the Reverse I took a large fallow, an 8 point Sika couple munty and some skins to namibia ,packed into a used material padded cycle bag (£20 ebay) ,along with a complete football kit for a youth team ,sports luggage packed in for good measure ..... for further protection it was a massive bag .
I had to have a uk vet and Namibia paperwork in place purely for Namibia side but it went through a doddle thought it was a challenge but excess payment for sport luggage no body queried it .........I did laugh when the baggage handler uk side asked me if the tyres were deflated and the pedals padded from piercing bag I just smiled nodded and agreed with him, once checked was slightly worried re the smaller internal SAA flight JBRG to Windhoek plane but it was checked through I even saw it on its own baggage trolley cart being deliverd to the small plane JBRG ,we all arrived no problem ,
did make for campfire talk ......