On the Thames it used to be that one bought a boat to get the mooring, then once you have your feet under the table with the mooring, change the boat to the one you actually want to live on.
Maybe you need to do much the same in Scotland. Buy a boat with a mooring you like. Buy the right boat in England at your leisure. Book a lorry to bring it to the nearest crane pad to your mooring, put your old boat on the same lorry to take it back south to a sales marina with a mooring on their sales pontoon in the midlands, and flog it.