I'm not on that side of the pond, however:

spare (spār)
v. spared, spar·ing, spares
v.tr.
1. To refrain from treating harshly; treat mercifully or leniently.
2. To refrain from harming or destroying.
3. To save or relieve from experiencing or doing (something): spared herself the trouble of going.
4. To hold back from; withhold or avoid: spared no expense for the celebration.
5. To use with restraint: Don't spare the mustard.
6. To give or grant out of one's resources; afford: Can you spare ten minutes?

From http://www.thefreedictionary.com/going+spare

Is this correct?