I haven't had many good experiences with agencies in London unless it is for business. However sorting them yourself can be frustrating.
It will depend a lot on which route you're taking and how flexible you are time wise, but getting all the visas or at least some of them can be very limiting in Africa when border regulations are somewhat fluid, and you have a time limited entry. British passports are still quite good for access and visas although expensive in W Africa.
If you have time I recommend getting them en route. Anything is possible in Africa with time, and money. A bit of pig-headedness helps as well.
Cheers and good luck
George
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