This is a classic example of taking a graph out of context and misinterpreting it, either on purpose or not understanding what it represents.
Link to the report:
https://assets.publishing.service.go..._-_week_40.pdf
Last paragraphs before the Tables;
Interpretation of data These data should be considered in the context of vaccination status of the population groups shown in the rest of this report. The vaccination status of cases, inpatients and deaths is not the most appropriate method to assess vaccine effectiveness and there is a high risk of misinterpretation. Vaccine effectiveness has been formally estimated from a number of different sources and is described earlier in this report.
Up a bit further is the comment on Vaccine effectiveness on preventing spread;
Effectiveness against transmission As described above, several studies have provided evidence that vaccines are effective at preventing infection. Uninfected individuals cannot transmit; therefore, the vaccines are also effective at preventing transmission. There may be additional benefit, beyond that due to prevention of infection, if some of those individuals who become infected despite vaccination are also at a reduced risk of transmitting (for example, because of reduced duration or level of viral shedding). A household transmission study in England found that household contacts of cases vaccinated with a single dose had approximately 35 to 50% reduced risk of becoming a confirmed case of COVID-19. This study used routine testing data so would only include household contacts that developed symptoms and went on to request a test via pillar 2. It cannot exclude asymptomatic secondary cases or mildly symptomatic cases who chose not to request a COVID-19 test (16). Data from Scotland has also shown that household contacts of vaccinated healthcare workers are at reduced risk of becoming a case, which is in line with the studies on infection (17). Both of these studies relate to a period when the Alpha variant dominated. An analysis from the ONS Community Infection Survey found that contacts of vaccinated index cases had around 65-80% reduced odds of testing positive with the Alpha variant and 35-65% reduced odds of testing positive with the Delta variant compare to contacts of unvaccinated index cases (18).
Hospitalisation and Mortality;
Effectiveness against hospitalisation Several studies have estimated vaccine effectiveness against hospitalisation in older all of which indicate higher levels of protection against hospitalisation with all vaccines against the Alpha variant (7, 8, 9, 10). Effectiveness against hospitalisation of over 90% is also observed with the Delta variant with all 3 vaccines (3). In most groups there is relatively limited waning of protection against hospitalisation over a period of at least 5 months after the second dose. Greater waning appears to occur among those in clinical risk groups (3). Effectiveness against mortality High levels of protection (over 90%) are also seen against mortality with all 3 vaccines and against both the Alpha and Delta variants (7, 11, 3). Relatively limited waning of protection against mortality is seen over a period of at least 5 months.
So in closing, when interpreting a report, READ THE WHOLE REPORT, don't just cherry pick something that agrees with you and look stupid.
PS, Transmission and Infection are two different things, Transmission you might get some virus detectable in you, Infection the virus can replicate to level considered 'infected'. I say this because if you read back the protection from infection even vs delta of a vaccinated person is 80%+.