It might be difficult to find out which named one it is Myriam, even now there are many which are similar. Those I bought in the supermarket had names of people probably in the family of the breeder, some were nearly alike. It is a beautiful flower, quite distinctive so you might be lucky but older plants tend not to be well represented on the web. You're lucky to have it still living, the late summer to autumn flowering ones seem to survive better than the spring ones.
There's 674 records for Erica on the RHS, if you feel up to it you could try searching for them.
http://apps.rhs.org.uk/rhsplan...
