I've had replies from Nicholas Hoult and Jack O'Connell

Received a reply from Jack O'Connell (Cook) today!

Mike Bailey: http://www.fanmail.biz/48148.html
Mitch Hewer: http://www.fanmail.biz/108922.html
Ollie Barbieri: http://www.fanmail.biz/125254.html
Jack O'Connell" http://www.fanmail.biz/123660.html
Alexander Arnold" http://www.fanmail.biz/114197.html
Will Merrick: http://www.fanmail.biz/125255.html
Sean Teale: http://www.fanmail.biz/125256.html
Dakota Blue Richards: http://www.fanmail.biz/106636.html

Fanmail

I have received replies from Luke Pasqualino (Freddie) and Hannah Murray (Cassie) so far

Jake O' Connell
Conway van Gelder Grant
8-12 Broadway St. 3rd Fl.
London, W1F 8HW

Will Merrick
United Agents
12-26 Lexington St
London, W1F OLE

Mike Bailey
Troika
3rd Fl. 74 Clerkenwell Rd
London, EC1M 5QA

Mitch Hewer
Industry Entertainment
955 S. Carrillo Dr. Ste. 300
Los Angeles, CA. 90048

Ollie Barbieri & Alexander Arnold
Independent Talent Group
40 Whitfield St.
London, W1T 2RH

Dakota Blue Richards
Artist Rights Group
4A Exmoor St.
London, England W10 6BD

Hope these addresses help

I only started watching Skins this year (thank you Netflix!) and am starting to send requests to the cast thank you for this thread!

I haven't gotten any replies yet but I have sent to:

Hannah Murray (Cassie)
Mike Bailey (Sid)
Luke Pasqualino (Freddie)
Mitch Hewer (Maxxie)
Ollie Barbieri (JJ)
Alexander Arnold (Rich)

Hey! I am a big Skins fan, as well!
The only person I have heard from on this list is Jack O'Connell,

Jack O'Connell
Insanity Artists
5 Little Portland Street
London
W1W 7JD

However, Dakotas address is:

Dakota Blue Richards
ARG
4 Great Portland Street
London W1W 8PA
UK

Mike Bailey
Updated Mitch Hewer
Ollie Barbieri
Jack O'Connell
Alexander Arnold
Will Merrick
Sean Teale
Updated Dakota Blue Richards

Please and thank you.