Have you thought about buying a piece of riverside land , that has its own mooring dc ?.
Land is getting more expensive over the last few years , but long term it would be much cheaper than living in a marina , and you can still cash it out when you've finished with it.
I was looking at narrow boats a few years ago , but it worked out to be as expensive as renting a house if you had a permanent mooring in a marina.
I looked at a nice piece of land , with its own 40yard Mooring . The thing that stopped me from buying it , was that it was next to a piece of council land , and Poli