I have hunted all over Southern Africa, and have several good friends out there who operate across SA and Namibia, all of whom I have known for close on 16 years and taken all the plains game with them, and dangerous game. If you PM me I will give you details and you can talk directly with them.
However it should be noted that as all the shows are on in the States at present, you will have difficulty contacting most good safari companies or PH's until after mid February, as they will be doing the rounds.
I would also make sure you know exactly what is included in the daily rate, and also trophy fees are trophy animals not cull animals. Also if field prep of trophies is included, wines and soft drinks, licences as well. If you hunt in Botswana will you need to pay transport costs of the trophies back into SA?. Is pick up and return included to major airport, and also be aware that brining a firearm inot SA is not so easy as it used to be, and also taking it into Botswana you will need permission at the border (or at least you did when I was there)
You will also find that some Safari operators charge differently if they know you are from the UK, the dollar dissapears and Euros or sterling kicks in. Check them out with the Hunting Report, or ask for references befre parting with any money.
There are many many operators in SA, some are very good, some mediochre, others bad, although it is rare to hear of really bad ones these days, most have died the death.