don't worry about them not getting back...they never do on the day they promise...but they will.
Its the truth, they are very busy.
I am a purser...I had my interview in person, also in England...in leeds. The guy told me he would tell me in 2 days whether I got the job, ...4 week later, after I was a nervous wreck...they called me!and now i am about to join my fourth ship (The spirit), my fourth contract and I love it!
So don't worry...they will be in touch and I am sure you will do fine.