Thanks Bob and Ann for your replies.
I have been to Crete once before, some 35 years ago with my young son (he's a granddad himself now ouch!).
In more recent times though I've come to know Zakynthos very well so am well acquainted with gorgeous Greek food.
My friend is coming on this holiday and although fairly well travelled she's never been to Greece. I'm confident though that she'll love it too.
Bob, I met you on the India tour in 2012 and Ann, look forward to meeting you at Heathrow in a couple of weeks.
Best wishes
Sue