Now fitted the lights featured at the start of this thread! Removing bumper not too painless thanks to guidance via this site - still quite a fiddly job, doesn't appear that Nissan put much effort into easy removal. Took the opportunity to replace the horns with better sounding ones as well as changing the reflectors. Except I forgot to put the new ones in when the bumper was off!! Couldn't bring myself to remove the bumper again and managed to fit them in about 30 minutes from underneath.
Lights look great - thanks Paul for quick turnaround - now trying to see which rear lights would best complement them. Will either be smoked or chrome Lexus style.