Skylarks and Meadow Pipits are still singing away on their territories and displaying. This bird sat on a convenient post and was in full song. Shame it wasn't a bit sunnier, but if it had been he's have probably been in the air.
The very worn feathers indicate (at this time of the year) that this is an adult. All the feather edges are chipped and in some the pale fringes have almost worn off - will be replaced as soon as the birds have finished breeding. This bird has actually already replaced the alula feathers (the three small feathers that are attached to the "thumb") and your can see their sharp outline. Any Skylark seen with complete bright feather edgings now will be a recently fledged juvenile.