Which sehri time should I follow?

Assalamualaykum

where does Suhoor time actually end?
I am in London and my masjid says around 3:15 but some a alsosays it ends at 1:00

Jazakallah

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Walaikumussalam w w

Follow the local masjid timetable. Your duty will fulfilled inshallah. The masjid timetables have been set after deep study and therefore, they are reliable.

If someone has another criteria they wish to follow, they can do so but they should keep that personal and they should not force others to follow their research.