Current indications are that the first services in the live testing operation will be tomorrow (27th April), and will be:
1: 1205 Dalston Jn – New Cross
2: 1210 New Cross Gate – Dalston Jn.
The full live testing service will then be available Wednesday onwards, with the first/last services:
1: 0705 Dalston Jn – New Cross
2: 0703 New Cross – Dalston Jn
1: 1957 Dalston Jn – New Cross Gate
2: 1955 New Cross Gate – Dalston Jn
As has become traditional over the last few weeks, it is of course worth pointing out once again that the above has not officially been confirmed by TfL and thus is most definitely subject to change.
[ADDENDUM – Fitz has indicated that he has received a confirmation email containing this date from LOROL customer relations, which probably counts as official TfL confirmation now]
If I find myself sat upon an ELL train tomorrow, however, I will obviously post immediate confirmation here.