Atkins Service Engineer interview questions

After 6 months of applying online and completing the situational judgement test I was emailed to pick a selection date for an interview. The interview day was confirmed over a telephone conversation via HR recruitment representative. On the same day I picked the date for my interview I got a phon call asking to t arrange it as the interviewer was no longer available. I only had the option for next day interview. Was told by HR it was going to be a relaxed interview - which it was but literally got no time to prepare and then at the interview as expected got asked numerous technical questions which lasted an hour.