The simplest way to make this journey is via Lille, which avoids a cross-Paris metro change between TGV and Eurostar. That does mean that you are fairly limited in terms of train choices and times, however. When travelling to London, you have a choice of two Eurostar services to catch, depending on how much you trust your train to be on time. Generally, services are reliable, but if you buy a non-refundable ticket, you could be left with an expensive journey from Lille to London.
Monday - Friday:
| Station | Station | |||
|---|---|---|---|---|
| London (Eurostar) | 06.19 | Nice | 07.24 | 07.24 |
| Lille (arrive) | 09.10 | Lille (arrive) | 17.47 | 17.47 |
| Lille (depart) (TGV) | 10.30 | Lille (depart) | 18.32 | 19.23 |
| Nice | 18.02 | London | 19.03 | 20.03 |
Saturday - Sunday:
| Station | Station | A | B | ||
|---|---|---|---|---|---|
| London (Eurostar) | 06.58 | Nice | 07.24 | 07.24 | 07.24 |
| Lille (arrive) | 09.32 | Lille (arrive) | 17.47 | 17.47 | 17.47 |
| Lille (depart) (TGV) | 10.30 | Lille (depart) | 18.32 | 19.23 | 20.32 |
| Nice | 18.02 | London | 19.03 | 20.03 | 21.03 |
A = Sunday only
B = Saturday only
If you don't like the look of this, an alternative journey would be London to Paris on the Eurostar, followed by Paris to Nice / Menton on the TGV.

