Good question. I had a quick look on google and found the following website:
http://www.nidirect.gov.uk/speed-limits-how-they-are-set One particular quote is of interest: "Although national speed limits can be set for Northern Ireland separately from the rest of the UK, it is current practice for those operating in GB to be replicated here for consistency." Maybe that doesn't help! Personally I would stick with "UK" unless the above practice is changed. (In any case as you have pointed out it can be argued that it doesn't matter as these tags can be automatically changed based on location) Regards, RobJN
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