Beth&Brood, I think the Mullerlights are on a so many for so much deal at Tesco (think it might be 6 for £2.??, very helpful I am ), three for £1.08 at ASDA and Iceland. An exercise video is a great idea, exercise makes a big difference, if you can try and make it to a class having someone shout at you is always helpful.
When I lost weight after having DS1 my Mum told me I would never be a size 12, just didn't have the bone structure for it, I always had been a big girl and probably always would be, I happily stopped at a size 14 (had been a 14 all my adult life and being tall don't look too bad at a 14). This time however I gave myself permission to be a 12 (if that makes any sense) and I am a large 12/small 14 who now wants to be a small to medium 12, who could on the odd occasion fit into a large 10 for the occasional ego boost .