Hi Rox, after much searching, I've finally found your Sunflower. It's a beauty, WOW! :o
Looks like it's a single stemmed variety. Height to 6ft. I have variegated Nasturtiums, the variegation didn't really start to show until the plants started to reach their mature size so if your Sunflowers are still quite small they might still colour up yet. Can only find them on the T & M US sight ??? even that was a struggle to find, finally got it after googling 'Sunspots' Variegated Sunflower.