Thanks to this weeks MSE email
Step 1. Sign up to a cashback site
Simply sign up to Weight Watchers (new WW customers only) by Monday 14 Jan via cashback site Quidco*. If it's the first time you've used Quidco then it will take a £5 admin fee from the cashback that you earn.
Warning! Cashback sites can pay you because they get paid by Weight Watchers for sending it traffic. Yet as the cashback isn't direct, and it involves tracking, there can be problems, and while it usually works never consider the cashback 100% guaranteed. If you couldn't afford to pay the £30 consider doing it.
To understand how these websites work, see the Top Cashback Sites guide.
Step 2. Sign up to the Weight Watchers Three-Month Plan
Once on Weight Watchers' site opt for the three month plan - it should say 'Sign up for FREE when you buy our 3 month plan, Save £32.95'.
Step 3: If you only want it for three months, ensure you cancel
If you don't want to carry on past the 'free' three-month period, make sure you cancel before the three months is up otherwise the plan will be renewed automatically and you'll be charged £11/month.