The £300ish fare was after taxes and charges.
Is the fare you see after tax and surcharges? Zuji usually shows the air fare only, i.e. excludes tax and surcharges.
I found I had to use my middle name but I added the space and it found my booking ok, but it is listed with no space on the virgin details. Thanks :)
Seriously cheap for HK and as typical, after booking with Cathay for £425 which I thought was a big bargain. Anyway bookmared Zuji and expedia HK for future reference. Off I go this sunday 8) Heat added for some helpful info's and thanks OP.