In theory, according to the IEE on-site guide, you can get 10 2.5mm singles in a 20mm conduit - if it is a straight run under 3 metres.
Once you have a longer run or bends the figure drops dramatically.
Once again in theory 6 x 2.5 and 3 x 4.0 would fit in a straight run.
That stuff's fantastic until your cables come of the draw wire and you try to pull them through again but struggle cos your hands are too slippery, I've been there many a time
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