They have pale greenish-yellow skin, occasionally with a faint red blush on part of it, and some russetting on the top.
The tree bears abundantly, but occasionally some trees become biennial bearers.
In England, the fruit ripens late July / early August.
For pies, crumble and sauce.
Keswick Codlin Apples were reputedly developed from a seedling found in a rubbish heap in 1793 at Gleaston Castle, Lancashire. 
 Morgan, Joan, and Alison Richards. The new book of apples. London: Ebury Press. 1993.