I did this last week, I did 12 reviews and have just had 3000 points added to my account! thats equivalent to £15! It says in terms and conditions max 3000 points per year but its not clear if thats just for calling nectar companies with the adverts so I have just done another review so I will check in a week or two to see if I got any more points! The reviews are short aswell only 190 characers so this doesnt take long at all!!
From Nectar website:
Find and use a business through Thomson Local and tell us what you think. You'll get 250 bonus points when you review a business on ThomsonLocal.com
Terms & conditions
To collect points for leaving a review successfully register your Nectar card number on ThomsonLocal.com, rate a business by leaving a review and collect 250 bonus points. Points will be allocated per Nectar collector within 28 days of leaving your review.
You can collect up to 750 points a week and a maximum of 3,000 points per year per collector (excluding bonus points). Your collection year starts when you make your first points collecting call to a Nectar advert. Thomson Local's fair use policy applies