Thanks Keith but my contract ends in March 2024 so what do I then? Can I continue on a monthly rolling 30 one and if so will I keep my 'benefits' i.e 700 free minutes (no longer offered I believe) and undoubtedly I shall be told that this would be a more expensive way of doing things. I presume that contracts offer cheaper monthly/quarterly chargers.
I would expect that nothing would change unless you were on some form of discounted rate, like some FTTC customers. You will just continue on a rolling monthly basis, as I do not think there was any discounted rate for ADSL. I pay £39.17 which includes unlimited weekend calls.
I saw no change when my contract ended a few years ago, apart from small yearly price increases.