| ORGANISATION | LOCATION |
| Oak Barn Workshops | Shropshire, England |
| Offa House - Coventry Diocesan Retreat & Conference Centre | Warwickshire, England |
| Old Country House | Worcestershire, England |
| The Old Rectory and Retreat Cottage | Pembrokeshire, Wales |
| The Old Red Lion | Norfolk, England |
| The Old Stable House Centre | Suffolk, England |
| The Orange Tree | North Yorkshire, England |
| Priory of Our Lady of Good Counsel | West Sussex, England |
| Over the Rainbow | Ceredigion, Wales |
| Oxon Hoath | Kent, England |
