It's unlikely to do any damage - in fact I can't think how it could? We drove our A6 around like it for a while after we'd identified the cause and were waiting for parts too

Thank you
I'm not technical at all - so just for my peace of mind really
The car I've borrowed has to go back at week-end and part isn't due til Monday - so making sure a short week-end drive won't do any harm

Part arrived - changed today - all sorted!
Thanks all for the help & useful suggestions - much appreciated!