Here are their full names and what they've been charged with:
Ernest Mariusz Bachowski: Affray.
Lukasz Chluba: Racially or religiously aggravated assault occasioning actual bodily harm.
Thomasz Tchorzewski: Two counts of racially or religiously aggravated assault occasioning actual bodily harm. Wounding with intent. Affray.
Robert Tchorzewki: Two counts of racially or religiously aggravated assault occasioning actual bodily harm. Wounding with intent. Affray.
None charged with grievous bodily harm however wounding with intent is serious, as is affray, especially if they are not first offences. Any racial/religious factor makes it more serious in the eyes of the law too. The photos in the Mail show bruising to the female victim's face and apprently the older male victim was glassed.
Looks like two of them are from the same family.
(note to Mod, not a cut and paste)