Do British people arrive on time?

Yes. To the British people the punctuality have a considerable value.
In Britain, people make great effort to arrive on time. It is often considered impolite to arrive even a few minutes late. If you are unable to keep an appointment, it is expected that you call the person you are meeting.

Colombians will typically arrive up to thirty minutes late for social engagements. A 10:00 pm party will often begin a half-hour to one hour late.