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Thanks for all the replies.
I just went outside to test everything during the day.
Collimation is fine so that's not the issue.
I was looking at a hay shed about 1 kilometre away and got a crisp focus using the 25mm plossl. Then I put in the barlow and refocussed. I didn't get the same picture, not as crisp.
I went though this process with all of my eyepieces and the same thing happened.
I even tried moving the barlow along the focusser tube and the eyepiece within the barlow, that only made things worse. So the barlow moving the focal point is not the problem either.
I have to conclude that the barlow has a bit of a film on it and needs cleaning. Looking at my eyepieces during the day was a good idea, one of them had a big fat finger print in the middle of it!
Looks like I have a bit of cleaning to do on the weekend.
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