Hi Kevin,
Garanti only made a small charge at this end (around 9 GBP). I am a Premier customer with HSBC in the UK and they confirmed before transfer that their charge was 30 GBP as we were not transferring to my HSBC account in Turkey.
Not getting any real benefits for being a Premier customer, as the Worldwide Travel Insurance you get as Premier customer doesn't apply if you don't reside in the UK, and it is not offerred by HSBC Turkey.
Cathy