Understood. Whilst some units have a public policy on resits, its less common for them to have a policy on taking four A levels over three years - which it what you'd be doing (if I've understood you correctly). Below I'm going to use resits as a proxy for your scenario - i.e. if a uni is less comfortable with resits, they're likely to be less comfortable with four A levels over three years.
Exeter say
here that, "We are generally happy to consider those who have or are re-taking part or all of a qualification, subject to any caps or numbers management relating to the volume of unconditional offers overall. Where predictions are not available for those applicants who are re-taking part or all of a qualification, we will normally base our assessment on the assumption that they are likely to achieve one grade higher than their original result."
Liverpool say
here that, "We accept applications from students who are re-taking their examinations. However, applicants should note that any offer they may receive may require them to obtain higher grades than those quoted as ‘typical’ requirements in the prospectus and that some high-demand courses may place restrictions on such applications."
Manchester say
here that, "If you are planning to re-sit the final Year 13 examinations, or have already done so, the University will consider your application, but we may require further information. Each case is considered individually."
York say
here that "We consider the following circumstances on a case-by-case basis, depending on the course you're applying to and the information supplied in your application:
• A levels taken over three years
• resits"
The other unis don't appear to have any official policy on this topic.