Rupert Grint
c/o Actual Management Ltd
27 Mortimer Street
London
W1T 3BL
UK

OR

Rupert Grint
c/o Harry Potter Productions
Leavesden Studios
P.O. Box 3000
Leavesden
Hertfordshire WD25 7LT
United Kingdom

They gave tips like making sure you plan out what you're going to say so it's not all excited and everything like that... composed, ya know?