I've just heard on Noor TV that after a few meetings, some scholars have decided that in the UK it is best to allocate a specific amount of time for Maghrib and Fajr:

Maghrib time lasts an hour from sunset

Fajr time lasts 1 hour and 40 minutes before sunrise.

It is interesting and I wonder which scholars participated in this and if they and others will be going along with it.