My daughter is currently on holiday in Fuerteventura, the Canary Islands. I for my sins have been tasked with watering her plants. Imagine my horror when I note that her Lupins are looking very sorry for themselves. Suspecting that I had failed the, one and only, task I had been given I gave the plants a closer look.
Both plants are infested with what I believe are Lupin Aphids (according to Google).
I have treated them with a proprietary bug spray but I suspect they have gotten to great a hold and the damage is done.
Only time will tell if the plants will recover.
WrAnTz 
Doesn’t look to good but not dead yet
No, not dead yet Jo, but looking close to deaths doorstep. Not sure if they’ll recover. The flowers were beautiful.