Thanks so much for your amusing replies. BernardSmith - worry not. My elderberry trees smell gorgeous! The garden is filled with their delicate fragrance at the moment, and they're definitely edible and delicious. No cat pee, thank goodness.
Winemanden.. Our intention in beginning our current splash into wine-making was to make wine to cook with, but we keep drinking it! We haven't managed to make an undrinkable batch yet, but there is yet time.
Don't worry though - no wine need go to waste. If it's not good for cooking, we can save it for unwanted guests.
You obviously know a lot about wine-making. I don't trust some of the online recipes - I think they'd turn out too sweet for me, but I need to learn more about how to use a hydrometer, so I am not floundering in the dark.
JoesWine.. thanks for that suggestion. I'll maybe try a grape/elderberry blend sometime.
Thanks again for the banter and all the advice.
N.B. Apologies for any confusion caused by me editing this after posting it. Having posted that a mango wine we're fermenting is horrid, I decided to taste it again and realised that it is now delicious, so I have cut out that comment.