Jayne - I grew up in a house fed by its own spring - pure sweet water filtered over thousands of years in limestone sequences and slate.....no bugs, no dead sheep.
sherrard, I cant's really see any harm in Malvern if it is genuine spring water.
Even mountain streams that are fast running are ok to drink - if there is a dead sheep in it, you are ok drinking water within 5 yards upstream but the Rescue recommended not drinking it within 300 yards downstream, adjusting the distances given the flow rate......