Have a read of this article (link below)... remember, breakdown cover is just insurance by another name... no more, no less. We have been with 'Autoaid' for about 7 or 8 years who used to be £39 for a couple, any car, but over last few years has drifted up to £59.99. On the rare occasion they have been needed, they were excellent. Your Green Flag quote sounds good, but you will need to move after a year if they significantly increase their price.
https://www.moneysavingexpert.com/car-insurance/breakdown-cover/