Posted: 16/07/2013 at 22:07
“Sports”, breaks or chimeras can arrive by freaks of nature. A mutation occurs causing a random change in the plants’ chromosomes brought about by insect damage, the weather or other factors. If you see a different flower, habit or leaf you can email the RHS (email@example.com) – they will put you in touch with nurseries looking for new plants.
Copied that for you get in touch and see what they say.