Thanks all! I feel like the luckiest person ever!

Yes, the address I used was:

David Tennant
Independent Talent Group Ltd.
40 Whitfield Street
London W1T 2RH
UK

Hope this helps! Mj0r, hopefully you'll hear back soon! When did you post? Also, are youUK based?

After years of being a fan of David's work, thought I'd give fan mail a go. Sent a fan letter, pictures and SASE to the address above on 21/09/2017, received these back on 27/09/2017 and all I can say is wow! Less than a week is crazy. I've only ever posted to one actor before and it took over a yea...