Prune partial tip bearing apple tree that is trained as a stepover espalier

Can anyone give guidance for how to prune a partial tip bearing apple tree that is trained as a stepover espalier? I have planted several varieties, all bought already trained as stepovers. Pruning all except the early Worcester, which is partial tip bearing, looks straightforward but I can't find any pruning advice on the early Worcester as an espalier. Thanks
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.