tictactoe

Hi I have read a few things a few things on the site but can't seem to find or maybe have missed a post on it. but my problem is my photo expires on my uk driving licence in febuary. I have no uk address. I have lived in spain for about 10 yrs. I can use my sister's address. this would not be a lie as I am eventually moving back to uk at the end of 2012. does anyone know how I could do this or what form I need. I have been to dvla website and they you can apply online. but I suppose this is just if you are in the uk and doing it online. does anyone have any info on this. or could you point me to a post that has discussed this. sorry if posted in wrong area. Thank you