thats great - cause i looked up and parks / and some other areas say "no drones from here"I understand your worries, but there's really no need.
The only problem in Oxfordshire to my knowledge is that you have a few military bases - Bicester is the one I know of. That should come up as a restricted zone anyway, as would any airfield. If you want to photograph landscape or villages, the best way is probably early morning, and keep relatively high. Do a recce, use OS maps, and find a quiet spot off a country lane for example to take off from.
Best of luck