Uni Clearing decision - Warwick or Bristol Watch
Its the course you study for three years - not the Uni. Make sure its what you want.
Even though it isn't your preferred degree, at the end of the day what will count in the eyes of future employers is how well you have applied yourself to your university studies. There are also many historical units available to you as part of a Classics degree.
You like Bristol, so go there. If want to concentrate on historical studies later, you could always do a masters. You're clearly not well enamored with the thought of living in Coventry, so ask yourself if it's worth going there to do the subject you most want?
This quote is attributed to Confucius (and there are ancient Greek parallels!):
Better a diamond with a flaw than a pebble without.
Warwick is more favoured by employers
OP - it's clear you prefer Bristol, and that's what you should focus on. Which uni would you feel most comfortable at, and which one would you be happiest at? You can always have a look at modules offered, and see if you can transfer to History in your second year, if the uni allows. Or, you could go on and do further postgraduate study on history. From the way you write, the history course isn't ideal for you at Warwick, and so you'd be at a uni you didn't want to go to, studying a course you don't like, as opposed to Bristol. If you have a look at the course and do some research, it may be more history based than you think?
Or, if not - would you be able to take a year out, gain more experience and possibly resit the A-Level you missed (however, as you were offered a place at Warwick I highly doubt this is needed!), or perhaps gain another qualification to strengthen your application? And then re-apply, perhaps looking into new courses that you would be offered with your grades, and finding a course (and uni) that is the best fit for you? Now you have your grades, it is a lot easier to find courses you will get on to, and then you can find the best one for you