The British do not have the purple heart. but if you are invalided out of the services due to your war injuries you were awarded the "Kings Medal" for your lapel,it is inscribed GRI surmounted by the crown. with the legend "For Loyal Service! inscribed around the front in a circle,. I have had mine since 1945,.what is more important is the disabled war pension that goes with it.
Cheers
Sapper Brian