Things to do in Heathrow Airport when you are there for a 12-hour layover (for Kolz):

- find the "quiet room" and arrange lounge chair/chair to make bed, catch up on sleep lost on red-eye flight.

- browse through Boots and the remarkable selection of differently-named British health care and cosmetic products.

- calculate the exchange rate from dollars to Tanzanian shillings in your head (practice that long division).

- make up names for the babies you see.

- study wildlife in guidebook so you are an expert spotter when you get out on safari.

- re-acquaint yourself with Premier League football and recent performance of Tottenham Hotspur.

- choose club to go to upon arrival in Dar-es-Salaam with ecstatic-to-see-you girlfriend and her cool friends.