Leaky Feeders

Two of the three hives on site, that aren't mine, have contact feeders in place. Both of these feeders have leaked and there is a [not so] nice wet spot of syrup leaking from the brood chambers of both hives. Wandering around yesterday I noticed a big fat wasp competing with the bees for a share of the sugar.

My concern now is that we're advertising the apiary to all and sundry with a taste for sugar that there's free food going and that hence there's a danger of the hives getting robbed out. I'm trying to get the other beeks to replace these feeders, or just remove them, as soon as possible.