Re: Maybe the only way to prevent this
Light touch regulation of banks which hasn't been strengthened in any meaningful way since they left power (and I believe they discussed weakening them further to "boost the economy"). Labour didn't do particularly well at regulating the banks, but neither did their predecessors and neither have their successors, there's too much banking money in politics for them to be willing to go along with that (if nothing else, a significant number of politicians have immediate family working in banking)