Where to address the letter !

I am applying for my ILR next week in person in croydon PEO.

I am in process of making of ILR application.

I want to get the letter from employer. My query is where we have to address the letter

Is it

To:
Assessing Officer
The UK Border Agency
Leave to Remain – SET (O)
Lunar House
40 Wellesley Road,
Croydon, CR9 2BY

OR

To:
Assessing Officer
The UK Border Agency
PO Box 591
Durham
DH1 9FS

rajesh1319 wrote:I am applying for my ILR next week in person in croydon PEO.

I am in process of making of ILR application.

I want to get the letter from employer. My query is where we have to address the letter

Is it

To:
Assessing Officer
The UK Border Agency
Leave to Remain – SET (O)
Lunar House
40 Wellesley Road,
Croydon, CR9 2BY

OR

To:
Assessing Officer
The UK Border Agency
PO Box 591
Durham
DH1 9FS

wont make a difference to the application....

I addressed it to Croydon....

Thanks for your reply !