The water pipe is a good protector from development (as are railways limnes and major roads) but golf courses aren't - they have closed in their droves in the recent past and there have been cases where clubs have specifically closed to be developed for housing (at the end of the day money nearly always talks). My son's house is built on Horsell Common due to a quirk in planning law involving previous usage of the land.
Nowhere is bulletproof I'm afraid as the spectre of government targets for new housing hangs like a black cloud over every district council.
Gosh, I seem to have joined the
@derek kelly Realist Society