Mistake in name on the HSMP letter

I finally recieved the Immigration documents , there seems to be a spelling mistake in my name .

I read somewhere that the original letter along with the request for change letter needs to be sent back along with the address to where the new letter has to sent.

My problem is i am not sure to which address i need to courier the documents , is it to

Highly Skilled Migrant Programme
PO Box 3468
Sheffield
S3 8WA.

or

7th floor
Fountain Precinct
Balm Green
Sheffield
S1 2JA


Appealing to people who have had the same problem to please let me know the address to courier it .

Suggest you ask them.