I done a search and last thread it 2 years old!!
Royal mail are posting letters to santa again and he is responding to as many as possible.
Just write to Santa making sure you provide name and address and be sure to affix a stamp;)

Santa/Father Christmas,
Santa’s Grotto,
Reindeerland,
SAN TA1

taken from link below :D
http://www.royalmail.com/portal/rm/jump1?catId=1000002&mediaId=80800761&campaignid=santa

It does not have a date but going on previous years it will be about 13th

Ahhh its a grear idean int it, im definately going to get Joe (even tho he wont have a clue it'll be nice to keep for him!)
My mate told me that NSPCC are doing one. It costs a 5 pound donation and is apparently on their website xxx

Here is a letter for free!

http://www.aaasouth.com/newsletter/1205/santa/santaletter.asp

Pick what background paper you want

just fill out your childs name and 3 things your child has done this year which was very good (eg. clean up his/hers bedroom etc)

then fill in a wish list what he/she would like for christmas

the name of your street he/she lives on

AND JUST PRINT

if you want to you can print a fake stamp that can be glued to an evolope and 'bobs your uncle'