Willow or Marsh

Hi Dave
No haven’t heard them I will try and record a song if I hear it !

Like Dave says the best way to tell them apart is the song however from the picture I would be leaning towards marsh tit. Marsh tits have a slightly smaller head, have less clean white cheeks, have a slightly glossy head and lack a pale strip on the secondaries (although this is hard to see due to the way the birds positioned)

How do I add another photo to this post ?