Where do you live in central Scotland? If you live near Edinburgh, you can get a fixture list from 'Run & Become' or maybe they could send you one, tel: 0131 337 3133 also can be found on www.scottishathletics.org.uk
As has been mentioned, most XC races are for clubs only, unless it says 'open' in the details. Im a memeber of a club called Lothian RC based in Livingston and Edinburgh (see lothianrunning.free-online.co.uk for details), but if this is not near you, I think that there are lots more around.
The next open meeting is in Aberdeen (maybe a bit far?) on 3rd Nov, then one in Kilmarnock on 10th Nov, one at Dunbar on 17th Nov, at Kirkintilloch on 1st Dec, but I cant see anymore on the fixture list that say 'open'. A good race which is off road for the future is Gartmorn 6 on 9th March tel:01259 214511