AFAIK Cervarix doesn't protect against genital warts so it would seem logical to conclude that they would be an unlikely side effect of that particular vaccine.
Something I find very worrying though is that the safety trials conducted with Gardasil showed that the vaccine could lead to a worsening of pre-existing HPV infections.
Considering that girls are not being tested for pre-exisiting infections and that it is known that HPV can be contracted through means other than sexual contact, I think this issue is hugely concerning.
Figures vary hugely but there have been studies done which show that between 30% and 52% of 11 year old children have signs of exposure to HPV. The idea that HPV is purely sexually transmitted is false. Of course one would need to examine results for the strain of exposure in detail to decide the relevence of this to HPV vaccines.
However current info definitely suggests that it is utter madness to vaccinate young girls without screening for HPV infection. It is entirely possible that girls are being vaccinated who have contracted relevent HPV infections by sexual or other means.
I'm guessing the info handed out to parents fails to mention the above.
scroll to pages 4,5 and 6 for info on vaccine worsening baseline infections