I also have glasses on in my US passport photo and I'm using identical photographs for this application, so it will be interesting to see if the HO is stricter than the US passport agency....
As I'm applying in person, I will take some non-glasses-wearing passport photo booth pictures with me, as a backup set.
ETA: Oh, they're doofuses. They changed 'Two recent passport-size photographs of yourself' to 'Two recent identical passport-size photographs of yourself'...then added 'identical' in the line about the partner photograph, even though that doesn't have to be identical because there's only one photograph.... *weeps*