Table 7.

 Costs of interventions

Intervention	Provider’s costs (£)	Total cost* (£)
Weight Watchers	55.00	76.87
Slimming World	49.50	71.37
Rosemary Conley	55.00	76.87
NHS Size Down	70.00	91.87
General practice	90.86	112.73
Pharmacy	90.43	112.3

*Cost per participant recruited includes £10 for call centre, £3.54 for practices to run search of their lists and for general practitioners to screen lists for ineligible participants, and £8.33 for invitation letters sent by practices (£1 per letter, with 12% response rate).