Said is probably not the best option for IB related roles, please remember that Investment Banking Associate roles are typically filled from the internship pool and the challenge with 1 year programs is that there are no internships. So in the best case you are looking at a situation where you complete the program and subsequently land an internship. Also, remember that UK/EU markets have banks filing Associate position through internal promotions and thus MBA recruiting is fairly limited.
A US based MBA program would be a solid bet for a career in IB particularly in you case since you are transitioning from Software to IB, so an internship would be critical.
Would suggest having a relook at your plans and schools shortlist.

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