sorry I can't help as I was never in the position of claiming benefits so never had a compliance interview. But I've just googled "DWP compliance interview" and there is a lot of information online.
However I suggest that you contact the Carers UK Adviceline team as they are the experts on all matters related to caring and benefits. I'm sure they will be able to advise you on what to expect.
Need expert advice? You can talk to the Carers UK Adviceline five days a week, no matter where you are in the UK or how complex your query is. We do benefits checks and advise on financial and practical matters related to caring.
Freephone: 0808 808 7777
Carers UK’s advice and information team based in London is undergoing staff changes. This means the Adviceline is closed on Thursdays and Fridays whilst we recruit and train new members of staff. We will be taking calls on Monday – Wednesday between 10am and 4pm. . You can email or write to the Adviceline and we will respond to your enquiries within five working days.
The Carers UK Adviceline also includes a listening service, there for you to talk through your caring situation with a trained volunteer who understands what you are going through. Available Mondays and Tuesdays, from 10am to 4pm.
If you can’t get through on the phones (lines are often oversubscribed) then send them an email, they’ll usually get back to you within 3-5 working days.