Actually we also noticed the detailed page links filenames are different from the .php file name.
Eg. See the link here www.2ndhandmobilephones.co.uk/
Check Nokia 1100 A Grade in right panel bottom links
second_hand_mobile_phones.asp?manufacturer=Nokia&model=1100 A Grade&condition=Pristine&id=160&title=model&group1=&group2=
and not on our site check this link
and all over the file names actually made are having '_' (underscore) in name. I mean the file name should be like second_hand_mobile_phones_manufacture.....
Can you comment on this?