Today, in a garden centre in the Peak District, I found Erica Arborea. This one is called 'Albert's Gold but I presume there will be others of a more mid green colouration. Like all ericas it prefers an acid or at least lime-free well draining soil. It can grow up to 34 inches in 5 years but is very tolerant of pruning and I think that in a soil slightly less to its taste it may be slower growing.