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Thanks everyone for your feedback.
Yes, it's a bad barlow.
LewisM and Shiraz: Interesting what you say. Of the 4 GSO eye pieces I have, the 10mm is the best. It's actually not that far behind the ES 11 mm I have just bought. The 25 and 15mm or pretty average and the 6mm is ordinary. There seems to be some inconsistency between GSO products. For a bit more money, I have bought myself a 6mm TMB Planetary II which is much better.
Loki: I have tried what you said tonight. The result is still poor. So a bad barlow it is.
Peter: I wouldn't mind trying your barlow. Do you still have my address?
Cheers,
Eric
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