Police Brutality?

Police in Nottingham appear to punch a suspect three times during an arrest, and taser him at least twice. Is this too much? How far should UK police be allowed to go? The susepct is apparently accused of GBH (Grievous Bodily Harm) eg stabbing, but does this excuse the police’s actions, bearing in mind that in the UK a policy of “Innocent until proven guilty” is upheld. Footage courtesy of TrentFM