Probably been commented on most years but our European Robin is quite a different creature to the American Robin

Ours, where I am in the UK are an all year round bird. They can be associated with winter but also can for example be known later in the year keeping an eye on a gardener in case a nice morsel is dug up. I believe they can be quite territorial so while you might see a group after fledging you'd not expect to see a gang of invaders (like our long tailed tits) Individuals can become quite bold and develop some sort of "friendship" with people.