Tesco Senior Software Engineer interview questions

I've done a 3 stages in a row Systems Design, Coding, Leadership process. After 3 business day the internal recruiter said I had passed the interview and everything was ok. One day after they said they were producing the contract etc. Recruiter asked me about starting date etc. Another day and I asked about the offer and they said CTO had to sign the contract. Today I received a call saying "Sorry we're not proceeding" . I had dropped other potential positions in the meantime and I was even studying already about their technologies. If I look from the bright side I think luckily I am not going to work for a company that lacks organisation. I'd never recommend them to any developer.

Intially a telephone screening consisting of 3 questions, 1 for system design,1 technical and 1 about leadership skills. After this an onsite interview was scheduled in Tesco welwyn garden city office. 3 rounds each of 1 hr. System design, programming and leadership skills test.