I logged into topcashback last night to check if I had any earnings to withdraw and noticed that they have a new payment option - tesco clubcard vouchers.
Additionally, they give a 5% bonus when withdrawing this way, so you get even more clubcard points.
Note that there is a limit of £50 cashback being converted to clubcard points each year.
Example: £10 in cashback will convert to 1050 clubcard points. The main benefit being that these can subsequently be converted to £42 worth of e.g.pizza express vouchers!