Thanks Celeste! This plant is in the glasshouse at Wallington hall gardens in Northumberland.
I'm always drawn to it when I visit as it is a really stunning plant. It's not something you often see, I guess the showier pelargoniums are more popular at garden centres but this is a real favourite for me. I asked the gardener who looks after the glasshouse if they ever propagate it. They sometimes sell plants. I'll post a couple more photos. It's such a fabulous intense red.
Sue