"Our minimum entry standard for 2021 entry is A*A*A overall, to include:
A* in Mathematics
A*, A in two other subjects - Further Mathematics is preferred but not essential.
Computer Science, Further Mathematics, Physics are recommended subjects"
So - you would have much more chance of an offer if you did FM.
And they are likely to favour applications from those who have done two of CS, FM or Physics.
If you do Maths, FM and Physics you have met the preferred/recommended subjects.
Drop Product Design. No University requires you to do 4 A levels, and you wont get any extra credit for doing that on top of the other 3. It doesnt look 'cleverer' - and its likely that you'll get AABB instead of A*A*A because a 4th subject is too much work. If you do Product Design instead of one of the 'CS, FM or Physics' you would reduce your changes of an offer.