So you'll be asking to switch to a course where you don't meet the subject requirements ("Two science subjects, one of which must be biology/human biology and/or chemistry") and where you're two grades below the grade requirements. If you'd applied direct to Neuroscience it would have been an immediate rejection for not meeting the A level subject requirements - so they're not going to allow you to switch to that course. Sorry.

You're best bet, I'd have thought, is to ask to switch to Science with Foundation Year BSc (
here), which has a grade requirement of BBB. The description of that course says, "Want to study a science degree, but you took the wrong A-Levels? This course is designed to give you all the knowledge you need to progress on to one of our science undergraduate courses. ... Unlike other universities, successful completion of your foundation year guarantees you progression on to your chosen undergraduate degree.*"
If you hit the "..." button to the right of the basic course details and then scroll down that panel it says, "We expect students to have an idea of the course they would like to progress on to before starting. You can progress onto a range of degrees, including:
Biology, Biochemistry, and
Neuroscience Courses (Including Genetics and Zoology)
Sport and Exercise Science
Biosciences Degrees
Chemistry Degrees (excluding Chemistry and Molecular Physics)
Medical Physiology and Therapeutics
Pharmacy
Pharmaceutical Sciences
Pharmacology
Psychology
Cancer Sciences
Natural Sciences"
You said above that you're "willing to do whatever it takes to catch up on missing knowledge". Does that include a foundation year?