Following all the effort of making the rolls,I just had to go and buy one, just to see if they had come out alright. And I'm happy to say that they had, and seemed to be selling well as I had to queue up for mine.
Sophie put loads of salad and a horseradish mayo in the bap,
before adding the freshly grilled fish,
and the result was pretty spectacular.
I asked a few random people I saw eating them if they were any good, and got very positive answers.