I've just tried this brew side by side with a bottled Fuller's ESB and Old Speckled Hen in a can. There was no reason to do this, as this beer is not based on either, in the slightest way.
The ESB and this brew are too different to make a comparison. Totally different flavours. I liked them both. No point in comparing the two though.
The Speckled Hen comparison was interesting though. The OSP has that stupid widget that ruins that beer for me. It smooths it out beyond recognition from the draught version.
As far as taste goes, the Gnaughty Gnome is more forward in hops and biscuit flavours. The OSH has a more subtle mouth feel due mainly to the widget. The OSH has a more earthy aftertaste, while the GG is somehow more robust in it's energy.
Did that make any sense at all? Probably not!! I REALLY need to learn how to do a proper description of beer!!
For what it's worth, I preferred GG to OSH (canned). I enjoyed GG and Fuller's ESB equally, but for different reasons.
Having said all that, GG was never intented to duplicate either of these beers in any way.