We manage on just over £1000 a month.
No rent or mortgage. Small amount of savings we have usually remains untouched, we run an old Volvo, have hobbies, dogs, but we don't do much that costs much money.
I was made redundant two years ago, at 62, and decided we would try to manage until I got to 66 and my state pension came through. It IS possible to do, and you will worry about it beforehand, I think once you have committed to it you will be fine, but that is dependant on how much you miss spending on treats and luxuries. In this I include new clothes, make up, hair dresser, bits and bobs for the home, buying others nice presents, etc. I would feel quite well off to have £1400 a month to be honest!
My best tip would be cook from scratch, and let your freezer be your friend, to make the most of bulk buys and bargains.
Once every six weeks or so, run freezer right down, this will probably give you a week without shopping bills, albeit you may have some strange meals.
For my mental health and wellbeing being made redundant and making the decision not to look for work has been one of the best decisions I have ever made.
Whatever you decide good luck!!