loveaturtle, I am really impressed that you took the time to research the screening guidelines.
The UK system is never going to be like the US system and it comes down to money. It is based on statistics and cost analysis.
The official answer to your why 25 query is on page 8 of this:
http://www.cancerscreening.nhs.uk/cervical/publications/cervical-annual-review-2008.pdfIf you up for some dry, official reading, here is the policy itself:
http://www.cancerscreening.nhs.uk/cervical/publications/nhscsp18.pdf I can't defend the policy completely, but for most cases, it does work. I have not followed Ms. Goody's story, but my guess is that she had the unfortunate luck to have been exposed to an aggressive strain of HPV early. It can/does happen. But don't forget that there are millions of women who have benefited from the NHS screening programme since it's start only 20 years ago.
The research in this area is ongoing and active. Our lab already tests samples for evidence of high risk HPV (as a group), and other labs can test for specific subtypes. This will become key as the testing becomes more affordable as women will be able to treated on an individual basis rather than as a statistic. The reality though, is that it is still a few years away due to the cost of these tests.
Remember, it cannot hurt to ask your GP to test you more often. You may or may not get anywhere, but the option of going private remains.