| Site | Principal Investigator | No of patients randomised |
| University College Hospital |
Dr David Williams |
19 |
| Birmingham Women's Hospital |
Miss Tara Selman |
2 |
| City Hospital Birmingham |
Dr Neil Shah |
1 |
| Birmingham Heartlands Hospital |
Dr Katherine Barber |
2 |
| Queen Charlotte's Hospital |
Prof Catherine Williamson |
6 |
| Liverpool Women's Hospital |
Dr Leanne Bricker |
6 |
| St Thomas' Hospital |
Dr Lucy Chappell |
5 |
| Royal Infirmary of Edinburgh |
Dr Fiona Denison |
2 |
| Royal Victoria Infirmary (Newcastle) |
Prof Stephen Robson |
3 |
| Bradford Royal Infirmary |
Prof Derek Tuffnell |
6 |
| Leeds General Infirmary |
Mr Nigel Simpson |
2 |
| Queen's Hospital (Romford) |
Mr Richard Howard |
2 |
| St Mary's Hospital (Manchester) |
Dr Jenny Myers |
1 |
| Homerton University Hospital |
Dr Ed Dorman |
3 |
| John Radcliffe Hospital (Oxford) |
Dr Deborah Harrington |
2 |