I'm 83, and have lived on one state pension + pension credit =£185 a week since my DH died 7years ago. I have no mortgage, and don't pay Council Tax, and get the usual dental etc concessions. I still drive my reliable old banger, just locally, and keep my independence, but will probably have to stop if my sight deteriorates any more.
How much you need in order to live comfortably depends so much on your lifestyle. My needs are simple, and my hobbies are inexpensive, so I manage quite well. I save a set amount each month, so have some savings to fall back on. As long as I don't have any unexpected horrendous expenses, such as needing a new roof, I'm doing ok.
From my point of view, your future income sounds fantastic, compared to my present one. I hope that things work out for you.