Posted: 14/06/2015 at 18:07
There are a few 'Jackmanii' but that looks like none of them. Whatever it is, it's an early large flowered one (group 2.) My best guess would be 'Fireworks' but colours vary on cameras and when put on the internet then viewed on different monitors it makes guessing from the colour shown virtually impossible!
You could have a look through this site: