firstly thankyou so much for your time and effort into producing this incredible response i apricate it a lot. secondly about doing A- level physics in one year i spoke to my head of year regarding this matter and she said its best that you just carry on and do it at uni as a foundation year, because to be honest ill be able to learn the content from experts and have a better chance of deepening my foundation knowledge. further more there are a handful of unis that do this such as Manchester, Nottingham ucl and Queens. i attended the Manchester open day and went to the foundation in physics lecture and it seemed very interesting and is mainly a lot of math modules. in addition they have a math and physics degree which i can enter by completing my foundation year in physics.
after considering my options as well as my grades i think ill stick with the foundation, because if i ever want to study a math's degree i always can in the future, i honestly don't mind learning my whole life i guess its just the costs that makes it difficult to happen. again thankyou so much for your response.