Hi Kay. I am afraid I cannot enlarge the photo to get a close look at the birds but the one on the fence appears to have a mottled chest whereas the house sparrow has a plain grey chest. The markings on the back of the bird on the feeder is similar to a number of birds. Male sparrows have very dark heads although the females are lighter. It is also hard to make out the exact shape of the beak on the bird facing us but it appears quite chunky.
I suspect these may be Dunnocks, which are very similar in some ways to sparrows but have a mottled chest. They are regularly seen in gardens and in numbers, particularly at this time of year when there are plenty of young around. The back markings are similar to sparrows. They are generally ground feeders but we do get Dunnocks on our feeders and they will occasionally sit on a fence. If you generally see them on the ground then it is more possible. My concern is that Dunnocks have dark beaks, sharper than a sparrow, which seems to argue against.
Would it be possible to crop the photo and re-post, please?