There are sentencing guidelines for Affray, Chris. Page 85 (that,s the document, not the pdf page no.) of this document.
http://sentencingcouncil.judiciary.gov.uk/docs/MCSG_%28web%29_-_July_2014.pdf
If custodial sentences are imposed they will almost certainly be concurrent as the charges arose from the same incident.
Out of curiosity, Reddangel, how did the matter get to the Crown Court? Did the Magistrates decline jurisdiction or did your boyfriend elect Crown Court trial?