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PeteMo said ....
Andrew thanks for straightening out my logic. It looks like our local group have sufficient mass to prevent the galaxies within form being 'flung away from each other'. This got me thinking could it be some kind of centripetal force that is 'repelling' galaxies away from each other? I'm assuming that all galaxies revolve around some kind of central point in the universe.
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No worries. The thing to understand with the expanding universe is that even though galaxies billions of light years away are receeding from us at incredible speeds (even faster than light), locally through their own space they would only be moving around the same speed as Andromeda is as it lumbers slowly towards us. This is because it's actually the space between them and us that is expanding.
Hope that makes sense.
Andrew.