Thanks for the suggestion, I've had a look at them but they don't seem to cater for the difficulties I have any better than others I've seen.

My balcony has solid walls at each end and railings at the front which are "Child-proof", i.e the gaps are about three inches wide.   Being on the forth floor it is often quite windy.  I've found that feeders narrow enough to fit into the gaps batter themselves on the railings and the birds don't seem to like them there.  Being so narrow they don't have anything to catch detritus that then drops onto the balcony below and annoys my neighbour, especially if it lands on laundry that they're airing.

My only other choice is to hang the feeders from the ventilation gaps in the sophits, the birds seem to like them there and use them.  It works OK with the cheap plastic ones I use because they are short but again have nothing to collect detritus.  The longer one I tried was not a success, the wind blew it into the window and knocked most of the seed out.  When I shortened the wire hooks to stop that happening the birds didn't want to use them as much.

I think their dislike is because in both cases they are too close to solid surfaces while trying to land on a moving feeder in the wind.

To update from yesterday.  Yesterdays early snow mostly disappeared but more fell during the night, so today is starting very similar to yesterday.  I think people in the houses have put out food as yesterday my feeders were mostly ignored by the usual visitors.  This morning I've seen a few sparrows, they don't stay long.  I hope the other birds are finding food in gardens where they are more sheltered from the freezing wind.