Call it furze here in Cornwall and everyone knows what you mean and no eyebrow is raised. It's different elsewhere in Britain. In most other parts of England gorse would be the commoner term. Whin is used mostly in Scotland but would confuse many Cornish denizens. We are an ancient country and these seemingly deliciously-illogical things abound in our language. 'Tis just the way things are, no peeves needed!