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Damien
Collimation will have to be way off for it to start affecting focus that badly.
Most likely culprit is the old ol' Skywatcher adapter issue. This has come up so many times that when I saw your post I thought "Bet it's a SW dob" and guess what?
I don't have a SW but from what I understand they come with 2 adapters, one for 2" and one for 1.25". I think people have put the 1.25" one in the 2" one and this puts the EP out of range to focus. (SW users correct me if I am wrong here)
Try some other arrangement with the adapters to get the correct focus.
Malcolm
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