Hi thanks for your information.I have lit bit problem to the police certificate.I done the one wich cost £10 as they said,this one also takes 40 days.So I don't if is gonna cause any problem?and I haven't receieved it yet.I was supposed to receive it about 2days ago.How long your police certificate took?
well, there has been a new Agreement between the American Gov and the British Security forces with regards to police certificate for Imigration purposes.The Old £10 one has been phased out and replaced by the £35
one.To be on the safer side it will be a good idea to pay £70 to get the express one which will arrive under 3days since your interview is just around the corner. For more info however, you can visit this site. http://www.acpo.police.uk/certificates.asp . You can actually download the form from here instead of going to the police station. Another important link you may need is this http://london.usembassy.gov/cons_new/visa/iv/ukpc.html
I hope everything goes well.