https://www.moneysavingexpert.com/deals/free-santa-letter-video
Hopefully this'll work but incase it doesn't i've copied the info. It's the Royal Mail that do it:
Free letter
Ignore the numerous companies advertising letters from Santa for a fee, there's a simple way to get one for nothing.
What to do:
Ask your child - or you can do it if they're too young - to write a letter to Father Christmas and send it to Royal Mail's address by last collection on Wednesday 15 December '10.
Your little 'un should receive a personally addressed reply before Christmas Eve.
What to include in the letter:
In addition to anything your kiddie wants to tell Santa, ensure they include their name, gender (for example, I've been a good boy/girl this year) and a reply address.
Also a list of of what they'd like for Christmas would be good too, but remember this doesn't have to include material objects!
Where to send it to:
Just pop it in the post (either a 1st or 2nd class stamp is fine) addressed to:
Santa,
Santa's Grotto,
Reindeerland,
SAN TA1
What does the letter look like?
They'll be sent a pretty little card with a standard greeting poem, plus a 'put the clothes on Santa' cut-out game.
I remember getting the letter when I was little, think it's a nice keepsake
