Company number 3 is my former employer, and the post was internal only - I was internal when I applied. Anyway, their feedback was that I was suitable, however they needed somebody instantly and did not have the time to re-employ.
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if you can prove this is what was said (or indeed written) I'm sure you could challenge the decision - your role was redundant, not you. When a firm is considering redundancies (depending on the number) it should consider you for other suitable positions - if you are the best candidate they can't use your unavailability as a reason for not giving you the job. Try Citizens Advice.