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Some plums take alternate years off, so you should get plums next year.
Pruning in wet weather - definitely not, because you run the risk of introducing fungal disease.
Pruning generally - plums are not pruned regularly in the way that, say, apples are. pruning just encourages more growth, so should be restricted to removing damaged or weak branches. They are big trees, and pruning won't change that, but make it worse.
Peter, it depends on when they flowered. In my area it was very cold and wet when my apples and pears flowered, so there were no bees around and I had very little fruit set. No bees = no fruit, unless you hand-pollinate them. The other thing is feeding. Fruit trees grown in pots need feeding regularly, as they soon use up what was in the original planting medium. RHS advice on that is here:
my victoria plum has only fruited every other year. Is this normal or does it need some kind of feed. Any ideas?