Name that apple

So, last year we planted a birthday present apple tree, which had "Golden Delicious" written on the package - we've already doubted the heritage of this, but now suspect that it may well be a discovery however any ideas welcome! The fact that it came from Tesco originally, and Tesco sell discovery made us suspect this may be one:

Spent a while on apple ID before the more direct route to identification occurred to us! This does however mean that the apples are probably nearly ready 😀