Thank you so much for this OP. I didn't know about it and I'm grateful. Like others have said, I'm on UC so whilst I'm unlikely to be able to save the maximum amount, being able to save anything and get a bonus is fantastic for sudden expenses and saves me facing a "heat or eat" dilemma down the line.
And for those jealous of the meagre benefits I'll get, Swap lives. Honestly. DH walked out and left me with 3 kids under 5. I pay over £1000pcm in childcare, and £1250pcm to rent a cold 2 bed house. That's before ctax, electric, gas, school uniform, petrol etc. I need to clear 3K a month in income just for essentials, which is pretty much impossible for any single person, so my benefits help close the gap so I can keep a roof over my kids heads and keep my job.