No I'm not suggesting you need Weight Watchers – nor does your bum look big in that. However perhaps you've a "friend" who might be interested in a loophole to get a three-month subscription to the points-based weight-loss scheme for free.

Normally you pay a £30 registration fee and £11 a month but, by combining two current promotions, you can wipe those out.

To get rid of the monthly fee is easy. Weight Watchers' current promotion saves you £33 automatically when signing up. Then to get rid of the registration fee, ensure you sign up for the scheme via cashback website Quidco, for £30 back.

Cashback sites are websites that list retailers and product providers and get paid if you click to a company through their links - but they give some or all of this cash to you. Now this usually works, though it can never be 100 per cent guaranteed due to tracking issues, but in this case that problem's slim. If you haven't used Quidco before, it'll take a £5 admin fee from the cashback you earn. See www.moneysavingexpert.com/weightwatchers for exactly how to do it.

However remember that while it's a three-month deal, if you don't cancel your direct debit with Weight Watchers, at the end of it you'll start paying £11 a month.