Here is a photo of an elder bush growing in the grounds of St Michael's Convent on Ham Common.
The Sisters have a lovely walled garden. I don't know whether they make elderflower wine or elderberry wine - but perhaps I will know tomorrow - after visiting the stalls at the Ham Fair.
Have you been to Petersham Fair?
Parsley, sage, rosemary and thyme,
Remember me from one who lives there,
For she once was a true love of mine.