HPV is very common and the majority of women will have a strain of HPV at some point throughout their life. A follow up is merely precautionary to see if there are any abnormal cell changes. Try not to worry, it’s very normal. The cervical screening service is exceptional in the UK and it aims to pick these things up as early as possible. It is likely your smear would have picked up greater indications than just HPV if there was something to worry about.