We (Carol and Russell at plot 3) have found a water key at the tap on plot four - apparently it's been there for two weeks unclaimed... but as ours disappeared when left in the tap we've popped it in our shed for safe keeping.  If it's yours let us know!! and we'll reunite you!

On the subject of ours - if anyone found a key in that tap back in the summer and wondered whose it was - it was ours :)