Re: Top down or bottom up?
That's exactly what happened. The original deadline was October 2017 to avoid the rise in Lloyds IT fees from £100 million to £200 million in 2018. However, that simply couldn't be met and so an excuse was mooted around interest rates or Brexit or something and a new date of April 2018 was chosen.
Had anyone bothered to ask the testers on the ground what they thought, the answer would have been unanimous. It ain't ready and won't be for another six months minimum. But no-one asked and anyone with any sense got out of the project as soon as they could.
Migrating an entire bank to a new platform in less than 2 years from start of requirement gathering was never going to happen and Sabadell was warned.