Caring for a terminally ill DH and work

If her husband has cancer, Macmillan cancer support may be a good place to start. Do they have dependent children?

Benefits is the answer. PIP for the terminally ill person (there's a fast track if they have less than 6 months to live with no need for face to face assessment; you prove the illness by getting a form from the doctor) and income support/UC for the carer. There's also help for paying mortgage payments, although this comes in the form of a loan from the government.
She also needs to think about taking medical leave from work.
She needs to seek help from her husband's team if getting herself financially straight is overwhelming; that's what they're there for.

I would just add, you can get Carer's Allowance from DWP if you look after someone on PIP for 35 hours or more and earn less than £120 per week (if for example you decided to work reduced hours). I second speaking to Macmillan about this.

Do they have critical illness cover on a mortgage?

He needs to claim PIP and then she can claim carers allowance if she is on unpaid leave or earning less than £120 a week. In addition to this he may be eligible for contributions based esa and/ or Universal credit.

There is no help with mortgage interest until you have been on an income based benefit for 39 weeks.

PIP, Carer's Allowance, new-style ESA. If she is signed off sick she should be getting SSP. if they have less than £16k in savings then Universal Credit, Council Tax Reduction.

PIP and ESA should be fast-tracked

Have assumed the DH is under 65? If over 65 the benefits are completely different.

If they have less than £8k in savings and are on a low income Macmillan also offer grants if a few hundred pounds for pretty much anything that might improve a cancer patients wellbeing.

He should also be automatically eligible for a Blue Badge.

Macmillan have benefits advisors who can help with applications for all the above.

If her DH has life insurance it may pay out early, some policies pay out if the insured has less than one year to live.

DH is terminally ill, he gets ESA and PIP, I work two days a week on the bank for NHS although this can be more or less, the team I am in have been amazing about flexibility. I haven't applied for carers as my earnings are greater than what is allowed. We also get CTC and child benefit. Look into council tax relief as well.

I am so sorry for your friend, it is a horrendous situation be in