In my opinion, no, absolutely not.
Those grades aren't just serviceable, but very good. I appreciate they're not in line with your expectations but the reality of life is that unless you are planning to go into a highly competitive or specialised field, your degree will be worth very little when it comes to getting a job later on. Applying that same logic, your A level results will be worth even less. If you're aiming for Oxford/etc and you will not settle for less, then obviously you already know the answer.
Otherwise, if you are able to get into a university that you like with a good course, then for god's sake do that instead.