Judging by the CT Directory, which shows members and their QTH, (in the Navigation bar, top left side of the forum webpage), it looks pretty thin in Oxfordshire. But that's just CT members.
I took a look at the Thunderpole CB map and it's a bit sparse there too, (link below)
But that's also just people who bought a CB from Thunderpole and registered on their map.
So a lack of response to your question might not be so surprising.
That doesn't mean CB users in your area are not there, just not here to see your plea.
The obvious choice is to listen on a CB at your location but is also fraught with issues. You may not be listening at the same time as anyone else or even the same channel. You could be 'listening' at the same time as someone else is 'listening' and never know either of you were there! (Which is why I always say to give a shout out transmitting in case someone else is just 'listening'
I've heard operators your way joining the Southern CB SSB Net, so there must be people but obviously they are on Sideband, (which usually carries you further than straight UK 40 FM anyway).
I also took a look at KiwSDR for you to see if you could scan local radio activity, but there are no receivers your way.
Link given below if you're interested in taking a look/listen :-
I hope you find contacts your way on CB, but if you really have the 'radio bug' it might be worth looking at getting your Ham ticket. Loads of Hams near your location and the Foundation 10W carries you hundreds of miles on certain bands. I made more contacts in the first week on the Ham bands than I ever did in over a year of CB
If you're really hooked, don't give up.
All the best,