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@pip
As this is a new bike, again the LBS should sort it out for you. Really, a new 'track' bike should not have chainline issues.
How much is the chainline off btw? If its a few mm then I'd measure the 'shoulder' of the cog (ie the bit between the teeth of the cog and the hub body) and try comparing it to other cogs. I'd suggest an EAI cog as they're really decent cogs and tend to have a standard shoulder size (which may be wider than the cog you have esp if its a cheapo one).
Bottom bracket spacers can be used behind cogs, but they really should only be considered as a last resort.