Sorry, don’t agree with this “MTB doesn’t exist” line. So how many places in the UK are good for “mountain” biking ?? Like most bits of the country, it’s ok for off road riding. I live about 10 miles NW, and have a whole load of 2-3 hour off road rides from my door, including a couple that go close to Banbury. Yes there’s some field edge involved on most, but if you know your way around there’s plenty of riding to do, and when mud conditions get bad there is no end of all weather stuff in the Cotswolds.
And re road riding, it’s also good in this area as traffic levels are low even on major roads. Still the normal count of dickheads though.
As for the town – avoid ! Live in one of the lovely surrounding villages and ride to work.