The London home of cacao tree. I managed to book free tickets for Sunday. Normally the price is £16 per ticket. Due to the fact that some people RSVP and don't show up there is a charge of £1 paid by PayPal.
We'll have a visit in the garden and stop for a hot chocolate and a cake at one of the cafes. List of cafes at Kew.
Read more about the Cacao tree at Kew website