Although patient-centred education (SEDRIC) and TENS have both demonstrated potential to improve daily PA in people with IC, the use of these components in combination has not previously been evaluated. Investigators therefore propose a 2 x 2 (TENS versus placebo TENS x SEDRIC versus no additional education) feasibility Randomised Controlled Trial (RCT) that will compare use of TENS against placebo TENS with and without a patient-centred education programme.