Leaving airport during layover?

I'm taking a flight from London to Lusaka, Zambia which has an 8 hour layover in Nairobi, Kenya. Does anyone know what the situation is as far as leaving the airport during a long layover for a few hours and then coming back to check in? Also, if anyone has done this before or has any info on the surrounding... show more I'm taking a flight from London to Lusaka, Zambia which has an 8 hour layover in Nairobi, Kenya. Does anyone know what the situation is as far as leaving the airport during a long layover for a few hours and then coming back to check in? Also, if anyone has done this before or has any info on the surrounding areas (taxi availability, sights to see, eateries etc.) that would be helpful.
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