Dought & clear - He started fasting in London and broke his fast in Riyadh

With regard to fasting, I started fasting in London and broke my fast
in Riyadh. What is the ruling on the time difference?.
Praise be to Allaah.
Your fast is valid, because with regard to breaking the fast, what
matters is the place where the fasting person is when the sun sets;
the time difference does not matter, whether the day is long or short.
InFataawa al-Lajnah al-Daa'imah(10/296) it says:
The scholars are unanimously agreed that the fast lasts from dawn
until sunset, and each person who fasts is subject to the rulings on
the place where he is, whether he is on the ground or in a plane that
is in the air.
In another fatwa (10/295):
The basic principle is that with regard to starting to fast,
breakingthe fast and the time of prayer, each person is subject to the
ruling of the land he is in or the air through which he is travelling.
If the plane he is in takes off a few minutes before sunset and the
day continues for him, it is not permissible for him to break his fast
or to pray Maghrib until the sun sets from the point of view of the
air through which he is travelling, even if he passes through the
airspace of a city whose people have broken the fast andprayed
Maghrib, so long as he can see the sun.
Based on this, whoever starts to fast then travels in a plane towards
the west should break his fast when the sun sets inthe place where he
is. Similarly if he travels by plane towards the east and wants to
fast, he should not break his fastuntil the sun sets in the place
where he is. The time difference does notmatter.
And Allaah knows best.