Um. Look. <tries to find words>
This is a hasty generalisation, but there may be two main groups of women who don't attend screening programmes.
The first group aren't going because they're not fully aware what a cervix is, where it is, or who has one. One reason might be that they speak English as an additional language. So that's a language barrier.
Another reason might be that they received a poor education despite being native English speakers. I once had a young adult woman, who had not been allowed to attend state education past primary school, ask me if women could get pregnant from oral sex acts on a man if they swallowed semen. Careful questioning revealed that her understanding of pregnancy had not developed beyond "the baby grows in its mother's tummy for nine months". She quite literally thought a pregnant woman had the baby in her stomach, so it made sense to her that swallowing semen could also result in conception. If you think she knew what a cervix was, you're off your rocker.
A third reason might be because they have learning disabilities; the screening rates for women with learning disabilities are much lower than for women without learning disabilities, across all types of screening. In one set of statistics, for 2014-2015, the cervical cancer screening rate for eligible women with LDs was less than half of the rate for women without LDS; only 30.2% of eligible women aged between 25-34 with LDs were screened for cervical cancer, compared with over 70% of eligible women in the same age group without LDs. This isn't a benign statistical quirk to be ignored, because women with learning disabilities also have a life expectancy that is 18 years lower than unaffected women.
The pat answer here will be "well awareness raising will help those women then! Isn't this campaign brilliant!"
If you're about to take anything I've typed so far as an endorsement of this installation, look at the photo in the OP again. After that, consider this form of phrasing from North West Cancer:
Almost 1 in 3 people aged 25-49 in the North West don’t attend their cervical screening. Yet our cervical cancer rates are 19% higher than the rest of England. Screening helps lower your chances of getting cervical cancer. That’s why it's so important to not leave your risk of developing cervical cancer to chance.
If you don't already know what a cervix is, where it is, or who has one, what has this installation done to inform you? How has it increased your personal awareness?
Frankly, I wouldn't be surprised if some people looked at that and concluded that "cervical cancer" affected the legs.
Now I will move on to the second group of women who don't engage with the screening programme. They do know where a cervix is and who has one: that's why they're not booking appointments to have a screening. Perhaps they have already experienced painful or traumatic screenings, or perhaps they have good reason to expect that any future one will be painful or traumatic.
Either way, they have plenty of awareness already.
What they need is reassurance that they will be taken seriously and treated with respect during an appointment. They want confirmations that they will be treated with gentleness and compassion; promises that the nurse or other HCP won't be dismissive. In short, adverts for screening need to build trust with prospective patients.
This installation provides none of the above. Its "jokey and cheeky" approach is actually counter-productive; in fact, it encapsulates the dismissive attitude to women's pain and discomfort that has led to so many women refusing to ever have another cervical screening test!