There may be a number of reasons for this Bert.
1. A crew member may have been injured in the crash and taken to hospital where he subsequently died. He would then have been buried in the nearest cemetery to that hospital.
2. Ambulances attending the crash may have been from different districts. The bodies would then have been taken to mortuaries relevant to the ambulance district and then on to the appropriate cemetery.
3. Bale-outs may have come down in different areas and not survived the landing.
4. Some cemeteries were earmarked for service burials, serving quite a wide area.
There are probably as many other reasons as you may think of, including the one supplied by Spikey, but I am not aware of any hard and fast rulings on the matter. Other Rootschatters may be able to help further.