| Location | Planned | Expected |
|---|---|---|
| London Marylebone | ||
| Harrow-on-the-Hill | 18:53 | 18:55 |
| Chorleywood | 19:10 | No report |
| Chalfont & Latimer | 19:14 | No report |
| Amersham | 19:18 | No report |
| Great Missenden | 19:26 | 19:30 |
| Wendover | 19:32 | 19:35 |
| Stoke Mandeville | 19:37 | 19:41 |
| Aylesbury | 19:43 | 19:51 |