I discovered a little-known app that made me a Spanish speaker in months

‘Un vaso de agua por favor, sin limón’ (can I have a glass of water without lemon please) and ‘lo siento, no entiendo, soy Inglesa’ (I’m sorry, I don’t understand, I’m English) might not seem like the *most* useful Spanish phrases.

But for a long time, these two sentences were all I could speak of that language – learning them from my late grandfather, who retired to Spain in his sixties.

I wish I had...