I wouldn't say you will get the job even if you attend the interview. They've already sent the first batch to HKG for training. From what I have been told, they are not interviewing within the next 6months, although they have an ongoing recruitment, as mentioned you can see why they have ongoing recruitment. You be amazed how many people's face expression had changed when they came out of the interview, probably after hearing the rates they will get. You only get paid when you are away from home. Had a nice little chat recently with a current serving crew and she said there are more people leaving then they can recruit. She also said most only work for about 2 years then leave.
Bearing in mind this is LHR.