Welcome, Its chaindriven so no belt to change. Not sure what service it would of been but maybe it was a P2?
I bought mine with 71k on the clock a year ago, and its been running perfectly ever since, and it just flew through another MOT
I paid less than 60 quid for the pair last year. Like i said have you tried the main dealers? I bought mine from BigPhil but at the time Nissan were selling them for the same price
to the forum, i'm getting an average of 27mpg and when i'm cruising at 70 its around the 32 to 35 mpg, even cruising at 80mph i'm showing over 30mpg. I plant that right foot quite often as well, i'm no sunday driver thats for sure.