I'm at Guy's and St Thomas' - they treat you as a single trust, and the senior consultants cover both hospitals. I got my pump through them and the DSN that I work with there is good. They also haven't turned their noses up at low carb either.
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Have you tried loosely wrapping your plain fish in foil, with a knob of butter inside, then just popping it into the oven for 10-15 minutes, depending on the size of the fillet you have. That keeps the plain fish lovely and soft. I did plain, fresh mackerel in this way a few days ago. I didn't use butter as the fish is already oily, so kept beautifully moist without it. I had however added about a spoonful of lime juice and a few chilli flakes. It was delicious!