They are:  (top to bottom, left to right)
 
Anton Wood and Dave Lowe at Karen Club swimming pool. (Probably about 1980)
 
Tim Heinen and Abdul at Hillcrest Secondary (About 1979/1980)
 
David Smith and Ricky Mathews in Nairobi National Park - we came across this python across the road, so David, Ricky and Ema Galman just had to stop and get it!!! (1982)
 
David Smith and Simon Belcher at Watamu - Xmas 1982!