Most Robins are resident (non-migratory) in their regions, facilitating development of subspecies. The UK Robin, subspecies E. r. melophilus, is said to have a stronger red-orange than its continental cousins (who are also less tame from a history of being trapped/shot for food), but the Tenerife Robin, E. r. superbus, a little more shy than the UK bird, has a much stronger red colour. Those on other Canary Islands are more similar to the European continental bird in colouring. Some class the Tenerife Robin as a full separate species.
Other plumage differences claimed on the Tenerife subspecies (shown above) are an all-white belly (UK birds have a greyish belly but often white in winter), a grey border between red and brown (several UK birds seem to have this also - see pictures below) and a white eye-ring (only seems to be half a white ring and some UK birds also seem to have this, possibly less extensively).