You're not that far from me.
There is a small brewery in Bicester called The Wriggly Monkey. Their beers are a bit too hoppy for my liking, but me, the Mrs and the folks next door pop up when we can. And if you like cars they are based on the Bicester Heritage site. The chief there is a proper petrol head.
The Angel in Bicester also has a brewery tacked on to the back, but I'm not really sure how much they brew and when. We like the Angel for a pint though.
thanks- ill give them a look! Theyve got a 15% discount on their beer in a bag selection as well in Feb