Thanks for that John.
I thought it was a bit of a long shot to suggest that the privet was 'stealing the fragrance' somehow, so your suggestion that her rose/s may not be David Austin varieties seems to be the only other logical explanation.
She appears convinced that they are David Austin as she came up the name at the start of the conversation, so she's either been sold roses that have been mis-labelled or she's got them confused with other varieties in her garden.
We suggested to her to dig them up and transplant them elsewhere, using soil improvements, manure, etc. Also, the nursery she bought them from offers a 2-year money back guarantee, so as long as she has kept the receipt she has that option to fall back on.
We'll have to quiz her again next time she's due for another grooming session - about 8 weeks time.
Thanks again John for answering that strange question
The David Austin roses we are growing are in pots, using tree/rose/shrub compost. What would you suggest John as the best means of feeding/treating them to maintain healthy and flourishing growth?
Laurie.