Results
Interviews, lasting between 30 and 90 min, were undertaken with 38 HCPs: 14 PIPs, nine GPs, nine CH managers and six CH staff. Participants were recruited from 18 of the 25 triads: six in Scotland, four in Northern Ireland and eight in England. There was no expression of interest from any stakeholder in seven triads. In three of these triads, the PIPs did not deliver the intervention; in the remaining four triads, the demographics and trial outcomes were similar to the sample interviewed. Data were collected from a heterogeneous sample of professionals and locations as shown in 
Three themes were developed. Theme (1) ‘