He should apply for housing benefit, @justanothernamechangemonday . He'd be entitled to quite a lot of HB, possibly the whole £600.
My MIL gets pension credit, because she only worked for 15 years and therefore doesn't qualify for state pension. She gets all her rent (council house, £165pw) and council tax (approx £1500 pa) paid from benefits, but only has £201 pw for everything else. That £300 makes a huge difference to her, it means she doesn't have to worry about putting the heating on.
I'm still working p/t at 68, because I need to build up enough savings to be able to pay for any house repairs etc that need doing, and to replace/repair my car should I need to. When I give up work, I will have just my state pension and a small private pension that will give me a tad over £300 a month after tax. I'll get a bit of help towards my council tax (and at over £1.5k pa, I'll need it).
My bus pass is pretty useless, as I live in a rural county with shit public transport. I thnk I've used it twice in the 2 years I've had it. I've been exempt from prescription charges since I was diagnosed with hypothyroidism more than 30 years ago, so no savings there.
I looked into selling my house and moving into a flat, but the service charges etc are so high that I don't honestly think I'd be any better off.
I'm going to struggle when I finally have to give up work, and that £300 will make a big difference. Last year I used it to pay the bill for my boiler service.