John, I'm a fan of the SPCo, but I was horrified at the price of a return Seacat sailing to Liverpool, which I was forced to buy. I couldn't wait a week and travel at a different time, although I did book three weeks in advance...£134!
Same week, Hull Rotterdam, 10 hour trip with cabin, £255 return.
Both as a foot passenger and the P&O ferry is like a mini liner, entertainment, nice choice of dining options, as I know you are aware of being a regular traveller.
I understand the limitations of operating on short journeys, but the SPCo is our lifeline, we need reliable travel at a respectable price.