Vauxhall Meriva rear running lights and rear wiper not working

Doubt they're shared,
use a bulb some wire and check using battery +V through the bulb to the grounds for those circuits.
See if the test bulb lights.

Thanks for reply. Have discovered that the fuse marked Rear Windscreen Washer is the one (it must be a juvenile who write these things), and that day running lights are front only.