Just an update...
I put in the nyger and sunflower hearts feeders on 7th January, along with the usual wild bird seed, peanuts and fat balls, and a water table.
Currently have 'resident' four goldfinch (think two pairs), a pair of chaffinch the last few days (hanging round under the feeders but not seen on them yet), a robin, two great tit, two or three blue tit, around 8 house sparrows (but occasionally up to about 20), similar numbers of starling, 2 wood pigeon, 4 collared dove, 2 feral pigeon, 2 fancy feral pigeon, 1 male blackbird, and last week 2 robin, but haven't seen either for the last week. Also had a sparrowhawk sitting in the sycamore at the end of the garden, once, watching the feeders. I know it has been seen regularly in the next street, and would love to see it back... with trepidation!
Really hoping the chaffinch pair will take to the feeders, and my next hope is for some greenfinch which I haven't seen yet but have heard a couple of times in the nearby park). Have also had a dunnock hopping about around the edge of the garden, seen sporadically.
Also, I upset the sparrows a bit by changing one of my small seed feeders to a 'six port' feeder, and none of them would touch it for three or four days, but they are all using it now, and the tits have started using it too.
Anyone having problems with nyger etc, it is definitely worth persevering. The goldfinches initially were only viewed first thing in the morning, but now they are out there all day long, and often sit for 4 or 10 minutes at a time on the nyger feeder.
Thanks for everyone's help here - very worthwhile indeed.
Debbie