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@Gordon
I don't know if this is any help? http://www.espruino.com/About+Bluetooth+LE
Basically Bluetooth LE is a bit confusing in that 'Services' can be used for Advertising OR as something that holds a characteristic when the device is connected.
NRF.setServices({}, {advertise: ['0x181A']});advertises the service 0x181A - but as I said in my reply at the top, that will likely be in a scan respose packet, NOT ADV_INDNRF.setAdvertising({0x180F:[1]});advertises service data 0x180F. That'll go in ADV_IND but I believe is actually a different type of data to the first option.NRF.setServices({0x181A: { 0x2A6E: { ...sets services and characteristics, and these are only available when connected.The first 2 options only transmit data when you're not connected, and only the second option will use ADV_IND. The first uses scan response packets.
Hope that's some help!