Mechanism of Bromination of alkenes?

[Chap]

I have come across 2 mechanisms of bromination of alkenes. One mechanism (the one in my A-level Chemistry book- University of Cambridge) states that a carbocation is formed, but my undergraduate chemistry course book (from the open university of sri lanka) states that a carbocation is not formed and a differenet mechanism is given, in which a bromonium ion intermediate is formed. This mechanism is acually supported by many websites I visited to; so I'm curious why I was thought a wrong mechanism in the Cambridge A-levels book. First of all, is it a wrong mechanism?

 

Thanks.

[hypervalent_iodine]

The correct mechanism is the one in which the bromonium ion is formed: