You'll be fine. London is safe so is Belfast, be sensible like you would any where.
You do not need to feel frightened.
Your mother is a control freak using irrational fear as control.

GO ON THE TRIP you will not regret it. You need freedom you need to break out that cage mother has trapped you in.
Fear kept me trapped for so many years.

And the day came when the risk to remain tight in a bud was more painful than the risk it took to blossom.

Anaïs Nin