(Sorry - started as a quick reply, but turned into a bit of a long story!)
Loads of bees on the upturned bucked thing who got very upset with me. . . . . . The other one the poly feeder was full of bees so something wrong there. How the heck do you top these up without the bees thinking you are robbing them?
Not sure what's going on there. With my current feeder, which sits on the crownboard inside the eke, there are no bees under the roof - there's no way in, 'cos the feeder blocks the hole. The feeder has a lid over the top that I can lift off to check on the syrup, and the cone through which the bees come in has its own cover - so the bees can crawl up out of the hive, then down the outside of the cone, but they can't get out. I can top the feeder up without interacting with the bees at all. The crownboard has a second hole, but I put a mesh over that to stop them getting through.
On the P***nes poly feeder, mine has an upturned perspex "trough" that goes over the raised bit where the bees come up - again, this lets the bees crawl down to the sugar, but should stop the bees getting out into the body of the feeder. (This is a revised design - their website refers to a change to stop the bees "coming out at you" when you remove the lid).
If yours doesn't have the inverted trough arrangement, it might be possible to put a plastic cover between the two walls that create the gap for the bees to crawl down - rather like the arrangement on the M***ore nuc feeder - you'd need to make sure there was room for them to crawl over the top edges of the entrance tunnel.
That said, I had an interesting experience with the bees pushing the central cover off a M***ore nuc feeder (suddenly bees everywhere!) - mine is now held in place by a couple of removable stainless steel wires across the top.
I'm not sure how clear that ramble was . . .
Tony.