Hi Jilly Windy Miller,
Not at all.
I've just spoken to our overseas team. Depending on who you are paying (our overseas agent or the Tour Manager) depends on which currency to pay with. On the 29th September you will be able to pay the Tour Manager therefore £sterling can be used.
Remember the Zambia currency is a closed currency so you will be unable to obtain this before you travel. The tour manager will be able to show you where to exchange this in resort. BUT also remember you will need $US for your Zambia Visa.
Kindest regards,
Julia