Having been to Africa 7 times and having got all my trophies back I can tell you much depends on the taxidermist in Africa.
1. You will be charged for dipping and packing, much depends on the taxidermist you are using. Many do not like to see the work leaving the country!!
2. Use a taxidermist in Africa who is well known to the PH or your friend, try and visit the studios and make sure you put your own tags on the trophies.
3. Make sure when he sends the trophies that the final bill on the box does not include the whole trip. British customs will charge you import duty and possibly Vat on the value of the trophies. I have known some clients to end up paying massive bills because the idiot in Africa put the entire cost of the hunt or trophy fees on the paperwork.
4. Make sure they do not treat the skins with Formaldehyde. They were knocking this stuff out a few years back in Zim and the trophies will be ruined. You will never relax any capes or skins if they have done this.
5. Make sure you have a competant company over here to handle the trophies when they arrive. It can save you a hell of a lot of heartache and money if you have someone to recieve them and clear them for you.
6. South African taxidermy work can be good or bloody awfull, although it is cheaper to have mounted out there I would advise you find a good taxidermist in the UK to undertake your work. You can get a mount done one at a time, and if you dont like it take it back. Once you have commissioned a taxidermist in Africa you will need to pay the whole bill before recieving them. Problem is if its bad you are stuck with it, also the frieght costs will be much higher for mounts in a box and they will recieve VAT by UK customs.
Good luck, but if you need any further help drop me a PM.
Sikamalc