Thank you, Maizie - very glad to have this advice about German flutes and how to avoid accidentally buying one!
Zixi, Sarah Jeffrey is an amazing player. I watched the link you sent and also a further two of her videos. You are right, she's not keen on the Dolmetsch! I'm going to phone EMS tomorrow and see if I can get some advice about which make / model to go for. Although Sarah demonstrates the plastic to good effect, it's noticeably less mellow than the wood. And as it's a big birthday coming up I can probably afford to push my luck a bit.