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@TheBrick(Tommy)
going back to the original question for a moment.
If the wheel is zero dish, I don't see why there should be problems setting up the bike as fixed vs single speed. May be they are using an asymetric cog and hence that put the chain line out by a mm or so? Even so should be easy to sort out with a diffrent cog.
What exactly where they trying to do for an hour and a half? If you refuse to change the bb and keep the cog all you can do is shift about / add spacers on to the axel to bump over the hub to correct the chainline and then redish (ugly hack but it would work). Maybe play about with spacers on the cog but that should not take long, measure the error, see if have enough thread to use x amount of spacers to move cog about. Done.
Does anyone know what hubs are on the flyer? The only other reason must be that the hub is really badly made such that each side results in significantly different chainline.
After all is said and done I do not understand why they did not just swap out the bb, I have been to the Evens in Holborn (close ish to work) and there is always a nice small fixed bike chained up outside, must be one of the guys or gals that work there and they should know.
I am slightly confused by this (I know I am easaly confused). Like David says fixed wheel is nopt their target audiance but it jst seem like there is something fishy going on.