Nectar are offering (only today left) the option to spend points at the increased/double value of 100pts = £1 at below stores
I have cashed all of my points for Argos vouchers - they have a long date (2 yrs I think)
I was going to wait for the spend £100 get £10 voucher offer to come back however, you don't need to wait... they currently have £5 off £30 spent on Personal Electrical Items
EVEN BETTER, the below stores have recently been refurbished and they are offering £20 voucher for every £100 spent!
Like I did, you can cash £100 worth of points and effectively spend £120 in Argos... remembering all of this came from £45 worth of points!!