The number of votes cast was 1531, and the turnout of eligible members was 56%, so that puts the number of members eligible to vote at 2735. I think. If membership was remarked to be approx. 3800 a while ago, there must be 1000 members who were ineligible to vote.
1,531 votes were cast by Tuesday 16 July at 10am
56% of eligible Well Society members had voted by this point
This ensured the turnout threshold of 35% was exceeded
330 Well Society members had voted to accept the proposal (21.55%)
1,201 Well Society members had voted to reject the proposal (78.45%)
EDIT - Basically, the maths suggests that there was about 1200 members eligible to vote who didn't vote. I think.