On your PNR can you see your ticket number? It will start either 932 (Virgins IATA no.) or 125 (BA's). Each ticket number will have to start with the same three digits to be a through ticket. If not then I'm afraid you are on seperate tickets and will have to collect and recheck you luggage both ways. Feel free to om with a copy of your PNR and I can answer your question definitely.