Boots have good scales you pay 20p to get weighed on! Most GP surgeries also run weight clinics, normally run by the practice nurse - its free to get weighed! I joined SW thinking if someone weighed me every week I'd get on better but all they talk about is food which made me want to eat.
Another option is not to weigh! Do what Bernice does and go by your clothes, the weight will fall off and what a nice surprise it will be when you stand on the scales and you have lost a few stone!